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Welding Plastic Magnifier Plate 2" x 4.25" 2.50 Diopter #18250    US $8.01

MAGNIFY 2 X 4.25 CHEATER LENS 1.25 DIOPTER PLASTIC-NEW    US $4.99

MAGNIFY 2 X 4.25 CHEATER LENS 2.50 DIOPTER PLASTIC    US $4.99

MAGNIFY 2 X 4.25 CHEATER LENS 1.50 DIOPTER PLASTIC    US $4.99

MAGNIFY 2 X 4.25 CHEATER LENS 2.25 DIOPTER PLASTIC    US $4.99

MAGNIFY 2 X 4.25 CHEATER LENS 2.00 DIOPTER PLASTIC    US $4.99

MAGNIFY 2 X 4.25 CHEATER LENS 1.00 DIOPTER PLASTIC    US $4.99

Welding Plastic Magnifier Plate 2" x 4.25" 1.00 Diopter #18100    US $11.81

Welding Plastic Magnifier Plate 2" x 4.25" 1.50 Diopter #18150    US $8.01

Welding Plastic Magnifier Plate 2" x 4.25" 2.00 Diopter #18200    US $8.01

MAGNIFY 2 X 4.25 CHEATER LENS 1.75 DIOPTER PLASTIC    US $4.99

Plastic Magnifier Plate 2" x 4.25" 1.50 Diopter    US $6.46

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	Plastic Magnifier Plate 2" x 4.25" 1.00 Diopter Sale Price: $6.46
	Welding Filter and Cover Plates, Individually Poly Bagged, Plastic Magnifier Plate 2" x 4.25" 1.00 Diopter

Donegan DA-3 OptiVisor Headband Magnifier, 1.75x Magnification, 14" Focal Length List Price: $60.69 Sale Price: $32.16

The Donegan OptiVISOR is a hands-free, headband binocular magnifier that has optical glass lenses that are ground and polished into prismatic lenses for quality and clarity, and is available in multiple dioptric strengths (indicated by the number in the model) which provide specific magnification power (X) at specific focal lengths, or distance from object. This magnifier enhances the size and resolution of an object or image, and is commonly used for a variety of applications such as jewelry-making, watch- making, needlework, artwork, electronic inspection, book-reading, print inspection, and stamp-collecting. The OptiVISOR magnifier features replaceable binocular lenses that have beveled edges that are mounted in an interchangeable plastic frame. An adjustable headband with padded leather comfort band conforms to a variety of head sizes and provides comfort for hours of continuous use. It can be worn over prescription or safety eyeglasses. A durable, plastic visor tips up above the forehead when not in use. Spring-loaded pivot screws hold the headband in a raised or a forward-facing position. The magnifier weighs 0.67 lbs., and comes housed in a protective shell and carrying case. It has a one-year limited warranty. Diopter (D) is a technical term for the measurement of the light curvature and thickness of a lens. A dioptric number and a magnification number are not the same thing. Diopter strength represents a specific magnification power (X). For example, a 5-diopter provides 2.5X magnification (at a distance of 8”). See the magnification chart. The higher the diopter, the more magnification a lens can provide. As magnification increases, distance to the object (focal length), and field of view (diameter, or narrowness of view) decreases. Magnifiers and prescription eyeglasses have a diopter value, such as 1.5 or 2. The dioptric strength of an accessory lens, such as prescription eyeglasses or an eye loupe, must be added to the dioptric strength of the magnifier to calculate total magnification. Magnifiers are devices used to enlarge the visual appearance of an object or image. Magnifiers come in a variety of styles such as hand-held, headband, standing, clip-on, eye loupe, and those that hang in a necklace form, or fit in a trouser pocket. Magnifiers are commonly made of plastic or glass. They can have one or more lenses with varying magnification abilities, and can have a binocular configuration with a single lens, or two separate lenses. They are sometimes used with LED or fluorescent light sources to help control viewing capabilities. Magnifier ability is often expressed as magnification at a specific length. For example, 1.75X at 14” means that when a magnifier is held at 14” from a viewer’s eyes, the object will be magnified 1.75 times (X) its actual size. As magnification increases, viewing areas and focal length decrease. Magnifiers sometimes have a diopter number, expressed as + or -D, which is a measurement of strength (or power) of the lens. Some magnifiers are marked with a dioptric number on the lens. A high diopter number has a higher magnification than a low diopter number. Aspheric magnifiers, unlike spheric magnifiers, produce a sharp image to the edge of the lens for less distortion. Magnifiers are widely used in jewelry inspection and fabrication, watch-making, needlework, artwork, reading, print inspection, and stamp-collecting.   Determining Magnification Diopter Magnification Focal length (Distance from object) Sample view 20/20 vision 20" (50.8cm) 2-diopter lens 1.50X 20" (50.8cm) 3-diopter lens 1.75X 14" (35.56cm) 4-diopter lens 2.00X 10" (25.4cm) 5-diopter lens 2.50X 8" (20.32cm) 7-diopter lens 2.75X 6" (15.24cm) 10-diopter lens 3.50X 4" (10.16cm) Donegan Optical manufactures and distributes precision visual devices for hobbyists and professionals in industry, home, office and crafts applications. The company was founded in 1952 and is headquartered in Lenexa, Kansas. What’s in the Box? OptiVISOR Fitted, plastic, carrying case Instruction manual

Donegan DA-5 OptiVisor Headband Magnifier, 2.5x Magnification, 8" Focal Length List Price: $60.69 Sale Price: $29.99

The Donegan OptiVISOR is a hands-free, headband binocular magnifier that has optical glass lenses that are ground and polished into prismatic lenses for quality and clarity, and is available in multiple dioptric strengths (indicated by the number in the model) which provide specific magnification power (X) at specific focal lengths, or distance from object. This magnifier enhances the size and resolution of an object or image, and is commonly used for a variety of applications such as jewelry-making, watch- making, needlework, artwork, electronic inspection, book-reading, print inspection, and stamp-collecting. The OptiVISOR magnifier features replaceable binocular lenses that have beveled edges that are mounted in an interchangeable plastic frame. An adjustable headband with padded leather comfort band conforms to a variety of head sizes and provides comfort for hours of continuous use. It can be worn over prescription or safety eyeglasses. A durable, plastic visor tips up above the forehead when not in use. Spring-loaded pivot screws hold the headband in a raised or a forward-facing position. The magnifier weighs 0.67 lbs., and comes housed in a protective shell and carrying case. It has a one-year limited warranty. Diopter (D) is a technical term for the measurement of the light curvature and thickness of a lens. A dioptric number and a magnification number are not the same thing. Diopter strength represents a specific magnification power (X). For example, a 5-diopter provides 2.5X magnification (at a distance of 8”). See the magnification chart. The higher the diopter, the more magnification a lens can provide. As magnification increases, distance to the object (focal length), and field of view (diameter, or narrowness of view) decreases. Magnifiers and prescription eyeglasses have a diopter value, such as 1.5 or 2. The dioptric strength of an accessory lens, such as prescription eyeglasses or an eye loupe, must be added to the dioptric strength of the magnifier to calculate total magnification. Magnifiers are devices used to enlarge the visual appearance of an object or image. Magnifiers come in a variety of styles such as hand-held, headband, standing, clip-on, eye loupe, and those that hang in a necklace form, or fit in a trouser pocket. Magnifiers are commonly made of plastic or glass. They can have one or more lenses with varying magnification abilities, and can have a binocular configuration with a single lens, or two separate lenses. They are sometimes used with LED or fluorescent light sources to help control viewing capabilities. Magnifier ability is often expressed as magnification at a specific length. For example, 1.75X at 14” means that when a magnifier is held at 14” from a viewer’s eyes, the object will be magnified 1.75 times (X) its actual size. As magnification increases, viewing areas and focal length decrease. Magnifiers sometimes have a diopter number, expressed as + or -D, which is a measurement of strength (or power) of the lens. Some magnifiers are marked with a dioptric number on the lens. A high diopter number has a higher magnification than a low diopter number. Aspheric magnifiers, unlike spheric magnifiers, produce a sharp image to the edge of the lens for less distortion. Magnifiers are widely used in jewelry inspection and fabrication, watch-making, needlework, artwork, reading, print inspection, and stamp-collecting.   Determining Magnification Diopter Magnification Focal length (Distance from object) Sample view 20/20 vision 20" (50.8cm) 2-diopter lens 1.50X 20" (50.8cm) 3-diopter lens 1.75X 14" (35.56cm) 4-diopter lens 2.00X 10" (25.4cm) 5-diopter lens 2.50X 8" (20.32cm) 7-diopter lens 2.75X 6" (15.24cm) 10-diopter lens 3.50X 4" (10.16cm) Donegan Optical manufactures and distributes precision visual devices for hobbyists and professionals in industry, home, office and crafts applications. The company was founded in 1952 and is headquartered in Lenexa, Kansas. What’s in the Box? OptiVISOR Fitted, plastic, carrying case Instruction manual

OMAX 20X-40X Digital Binocular Stereo Microscope with Dual Lights System and USB Digital Camera List Price: $420.00 Sale Price: $209.95

Packing List: Binocular stereo microscope with 2x and 4x objective; 1 pair of WF10X eyepieces;8W fluorescent ring light with tube;1 extra ring light tube;Black/white plastic stage plate;Rubber eyeguards;Wrench for tension adjustment;Dust cover;USB digital camera 640x480 with 0.5x built-in reduction lens;Software and driver disc for Windows 98, ME, Windows 2000(SP.), Windows XP, Windows Vista 32/64bit and Windows 7

New 5X Magnifying Lamp Light Clamp Facial Skin Salon Equipment UL List Price: $59.95 Sale Price: $39.95

Our Professional Magnifying lamp comes with low heat 22W Soft bulb 5X Diopter Magnifying extra large lens, ideal for professionals, hobbyists, craftsmen, needle workers and beauticians. FEATURES: CE & UL APPROVED; 5X Diopter Magnification; Soft Heatless 22W Bulb; ON and OFF Switch; Includes 5" Glass Lens; Voltage AC110-120V; Frequency: 60Hz; Securing Plastic Lens Cover; Reliable and Secure Table Clamp; Adjustable Height and Length; Adjustable Lens Head Rotate 360 degrees; Professional, Low Head Magnifying Lamp with Extra Large Lens; Supplied with 22W Day Light Simulation Tubes for Excellent Colour Matching; High Quality, Extra Large 127mm(5") Glass Lens 5X Diopter Magnification; High Light Output Enhances Clarity and Low Heat Increases Comfort; Fully Adjustable Internal Spring Arm can Hold the Head in Any Position; Ideal for Professionals, Hobbyists, Craftsmen, Needle workers and Beauticians

	ANCHOR BRAND MP-2-1.25 1.25 DIOPTER GLASS MAGNIFIER LENS 2"x4 1/4" - CLEAR
	"ANCHOR" GLASS MAGNIFIER LENS Magnifiers offer optically balanced magnification in 0.25cm. Material: Ground Glass Color: Clear Length: 4 1/4" Width: 2" Diopter Strength: 1.25

	OMAX 5X-60X Binocular Stereo Microscope with 2.0MP USB Camera and 54 LED Ring Light List Price: $700.00 Sale Price: $349.95
	Packing List: Binocular stereo microscope with WF10X/20 eyepieces;A pair of WF20X eyepieces;Auxiliary objective lens 0.5X;Black/white plastic stage plate;Rubber eyeshields;Dust cover;54 LED ring light;100v~240v wide voltage range power adapter;48mm thread metal adapter;2.0MP USB camera;0.45X medium lens;CD (camera drive and software);USB cable;30.5mm eyetube conversion adapter

	OMAX 20X-40X-80X Single-Bar Boom Stand Stereo Microscope with 64 LED Ring Light List Price: $770.00 Sale Price: $384.95
	Packing List: Binocular stereo microscope;A pair of SWF10X eyepieces;A pair of WF20X eyepieces;Boom stand (head holder diameter 84mm);64 LED ring light;Power adapter;50mm thread ring light adapter;Rubber eyeshields;Wrench for stand assembly

	OMAX 3.5X-90X Zoom Dual Light Trinocular Stereo Microscope List Price: $970.00 Sale Price: $484.95
	Packing List: Trinocular stereo microscope;A pair of WF10X/20 eyepieces;A pair of WF20X/10 eyepieces;0.5X auxiliary objective (D50mm);Clear glass stage plate;Black/white high quality plastic stage plate;Rubber eyeguards;Stage plate lock screw;Power cord;A pack of lens cleaning paper;Dust cover;Extra halogen bulb 12V/10W with reflector;Extra halogen bulb 12V/10W;Extra fuse;Manual

	OMAX 3.5X-90X Zoom Binocular Stereo Microscope List Price: $880.00 Sale Price: $439.95
	Packing List: Binocular stereo microscope;2 WF10X/20 eyepieces;2 WF20X/10 eyepieces;0.5X auxiliary objective (D50mm);Clear glass stage plate;Black/white high quality plastic stage plate;Rubber eyeguards;Stage plate lock screw;Power cord;A pack of lens cleaning paper;Dust cover;Extra halogen bulb 12V/10W with reflector;Extra halogen bulb 12V/10W;Extra fuse;Manual

Here are some more information for Diopter Plastic:

LASIK - laser vision correction, is a procedure for the correction of moderate to high degrees of myopia (nearsightedness). LASIK will also correct low to moderate degrees of hyperopia (farsightedness) and astigmatism associated with myopia.

In order to really understand the LASIK procedure, the patient must have a working knowledge of the Cornea. The Cornea is a clear window to the eye and is transparent tissue. Generally, the cornea is 11.5mm in horizontal diameter, which is roughly ½ inch. The center most portion of the cornea is about 500 microns thick.

The day of the procedure begins with the arrival at the center of choice. Of course, the first matter at hand is collection of payment and consent forms. Oral Valium, in most cases, is dispensed to relax the patient. Pre-operative topical antibiotic, anti-inflammatory and anesthetic drops are given.

The patient will be escorted into the surgery suite. The surgeon will then examine the eye under the slit lamp and will apply a gentian violet dye to the pupil. These markings give orientation for astigmatism, when patients lie down their eyes tend to roll slightly; therefore, these marks allow for a perfect line up. Also in the case of a "free flap", the mark would allow proper orientation of the cap back on the eye.

The patient is now ready to be placed in position in a reclining surgical chair. Eyelashes are covered with a plastic drape and a speculum, lid holder, is inserted to hold your eyelids open. The opposing eye is patched closed. LASIK is most commonly performed bilaterally (both eyes on the same day). Patients remain awake during the procedure, and the eye is numbed with drops. There is no discomfort during the procedure.

The patient will be asked to focus on a light, most surgeons provide a coach or hand holder to assist the patient through the process. The coach's job is to tell the patient everything that is going to happen before it happens. Patients will also be reminded to focus on the light, keep still, and breathe normally.

The surgeon will begin the placement of the suction ring (the microkeratome blade will attach to this), once good positioning is obtained, suction is applied. The patient will generally feel pressure and vision will go dark; however, there is no pain involved. The microkeratome will be placed on its track, after an adequate amount of pressure is fulfilled. The surgeon will then start the microkeratome blade across the cornea creating the flap. The flap is left attached to the cornea by a hinge, which is made by having the microkeratome stop before it fully traverses the diameter of the cornea, leaving an uncut portion. The flap is 160-180 (about 4 human hairs) of the 500 microns. The patient will hear a buzzing sound and feel a mild vibration. Once the flap is complete, the suction ring and the microkeratome are removed.

The flap is then lifted by the surgeon, and folded back out of the way. Then the excimer laser is used to reshape the remaining surface of the cornea. The laser treatment typically lasts less than one minute. During the laser treatment, the patient will hear the click sound of the laser and might also smell a slight burning odor. The treatment will last from 30 to 90 seconds. One diopter of correction will take approximately 8 seconds. The surgeon has control of the treatment at all times. Should the eye move off center, the surgeon could stop and then restart the laser treatment. The amount of laser treatment necessary is based on the patient's particular prescription. This information was programmed into the laser prior to arrival for surgery.

Once the laser treatment is complete, the surgeon will irrigate the treated area and lay the flap back into its original place where it will adhere to the eye without the need for sutures. Topical drops will be applied and the area will be smoothed. Most surgeons wait 1 to 3 minutes to insure the corneal flap has fully re-adhered. At this point, patients can blink normally and the corneal flap remains secured in position by the natural suction within the cornea. While it is possible to dislodge the corneal flap during the first day or two by physically rubbing the eye, this event is actually quite rare. Before the patient leaves, the surgeon will examine both eyes to insure that the flap is still in position.

Since the protective layer remains intact with LASIK, patients are only placed on an antibiotic and anti-inflammatory drop for about a week. Preservative Free artificial tears are used initially for dryness. Vision is usually quite good the following day with LASIK.

LASIK patients are instructed to wear protective eye shields while sleeping the first night to prevent accidental trauma to the cornea flap during the early healing period. The excimer laser is an ultraviolet laser, which utilizes Argon and Fluorine gas to create a non-thermal, or cool beam, of laser light, which can break molecular bonds in a process commonly, referred to as "photoablation". A simple way to imagine how the laser works is to think of it as placing the curvature from your glasses or contact lenses onto the front surface of your eye, allowing you to see without corrective eyewear.

By Shawn Powell - Austin, Texas

Shawn Powell is the Director of Marketing and Advertising for the Howerton Eye & Laser Center. Ernest E. Howerton, M.D. has been serving the Austin community for over 20 years. Having the procedure performed on him, Dr. Howerton understands the importance of the surgeon seeing the patient at every visit. He believes this practice is paramount to patient care and recovery. The Howerton Eye & Laser Center performs LASIK on site, with state-of-the-art equipment and an affordable, all-inclusive fee structure.

Traditional and new intraocular lenses

Artificial intraocular lenses (IOL) was firstly approved by FDA in 1981, before which patients had to wear thick plastic eyeglasses or particular metal glasses in order to offset the focus distortion brought by cataracts removal. But now, most surgeons are concerning about the surgical technique and lenses design of the various IOLs, such as premium IOL, toric IOL and so on. Both the patients and doctors are more careful about the functions of different types IOLs.

Monofocal IOLs can offer vision at only one distance, which are competent for cataract patients with blurred vision at a single distance. However, if the patient after a cataract surgery can not see objects clearly at both distance and middle distance, monofocal IOLs are not the proper choice. IOLs that provide more than one vision are needed, which are called multifocal IOLs. Those brands include Crystalens, Tecnis and Rezoom. Another form of premium IOLs is presbyopia-correcting IOLs, which also require an associated extra surgery cost.

In fact, toric IOLs that are designed to correct astigmatism will also be charged with an extra fee, since they provide special effects. There are two types of toric IOLs that are approved by the FDA, namely Staar Surgical IOL and AcrySof IQ Toric IOL. While the first type can correct up to 3.5 diopters of astigmatism, the latter type are capable of correcting astigmatism between 1.5 and 3.0. These toric IOLs can even be applied to lenticular astigmatism, although the procedure is more complex and the risk is higher. Currently, most of the cataract surgeries involve making incisions in the cornea.

Similar with contact lenses, IOLs can also take use of the technology of monovision, creating monovision with IOLs. Monovision with mens reading glasses are designed to correct presbyopia, which is the same target of monovision with IOLs. If the patients have presbyopia in both eyes, the cataract surgery may implant an IOL for near vision in one eye and another IOL for distance vision in the other eye. Once accustomed to them, patients can get both good distance vision and satisfying near vision.

Younger cataract surgery receivers can benefit more from the new type of aspheric IOLs, which have flatter periphery and provide better contrast sensitivity. In addition, the Akreos AO Aspheric IOL can reduce visual aberrations, and the Tecnis Z9000 is adjustable in a variety of light conditions. Nevertheless, aspheric IOLs may be ineffective for old people. Contrast sensitivity is determined by the retina’s ganglion cells, which disappear with aging.

Since UV lights are suspected to cause cataracts, IOLs that are capable of blocking them out are helpful. AcrySof Natural is one of this type which uses a transparent yellow tint to filter out both UV and blue lights. These artificial IOLs just perform in the way as your natural lens.

A piggyback lens means the lens that is covered over a first lens, which is needed if the first artificial lens can not provide satisfying vision for the patient. And for people with severe myopia or astigmatism, a combination of two IOLs will be implanted within a single time, in order to provide enough vision correction.

There are many factors about IOLs that worth your careful consideration. Experienced surgeons are more confident to deal with all situations aroused in the procedure. Even cataract removal and IOL implantation have high rates of success, patients should be aware about the IOLs type, incision size and potential risks.

Most of the traditional IOLs have been covered by Medicare and some insurance plans. Since people are increasingly willing to accept new IOLs, some insurance companies will cover them for sure.

Article Source:http://vision.firmoo.com/eye-diseases/traditional-and-new-intraocular-lenses.html

About the Author

Vision Library
is the information source in area of vision care, including eyeglasses, sunglasses, contact lenses, sports protective eyewear, vision error and diseases, vision surgery, ageing and kid's vision etc., solely sponsored by Firmoo.com, an emerging online optical store.

Which refraction index should I get for my glasses?

I just got a new glasses prescription:
OD -5.75 -0.75 x130
OS -6.00 -0.25 x040

Just so you know. Cr-39 IS the 1.57. The rest are just a higher index of plastic, but not called CR-39. I have a -6.75 and I have been an optician for 27 years. I use one of two. I either use the 1.67 or Polycarbonate. Polycarbonate is technically a higher index material and is thinner and lighter weight. Most of the 1.67 matterials are aspheric automatically, but with the Cr 39 (regular plastic) the polycarb, and the other indices 1.60 on up, you can get these in what is called an aspheric lense, which gives you better clarity, less minification, and a thinner flatter lense. To get the best of all worlds I would reccoment this"

First...get a frame that is plastic and has what we call little or no decentration. This means that your eye sits in the dead center of the lense. We do not want the fram squshing your head though, so make sure it fits you head well still. Second, get the polycarbonate with an aspheric design, and ask for an AR coating as well. This will usually (I said usually..) be more cost effective than getting the other fancier lenses. The deal is that you do get what you pay for in most instances with yoru RX. To get the most for your money I would call around and ask about pricing and scratch and breakage warranties. Also, make sure you are working with an experienced optician so that you get the right measurements as well. In my office here are the prices you would be looking at:
Frames range from $90 to $600 and everywhere in between. All my frames have a 2 year breakage warranty. No copays, you do not pay for my warranty. It is in there.

Plain CR 39 (No scratch warranties, no uv, nothing.) $70

Polycarbonate (Scratch coat, UV, 1 year warranty against scratching) $122

Aspheric design $20

Anti Reflective coating:
Regular (Nice optics, tough,1 year warranty) $65
Premium (Fantastic optics, very tough, 2 year warranty) $105

So, I would reccomend the Poly aspheric ($122 +20= $142) and a good frame. If you can swing the Ar coatings do so, you will love it on a high minus correction as it clears up night time driving glare, computer screen glare, and overhead lighting glare. Do not worry about your glasses looking too thin. Most people do not worry about that. Good luck!

Lions see use for used eyeglasses
You are cleaning the drawers in your home and run across several pair of eyeglasses that no longer fit your new prescription. What can you do with the eyeglasses you and your family no longer need? How can you just throw them away? Isn’t there someone who can use them?

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