O P T I C A L     D I S P E N S A R Y

High Fashion Eyewear

OPTICAL DISPENSARY SERVICES Eyeglass Prescriptions Filled Highly Trained & Knowledgeable Opticians Friendly Professional Care Premium Quality Frames Hi-Tech Lens Designs & Materials Individualized, highly trained, personal and friendly professional service is always given at Dr. Harger's optical dispensary. His paraoptometric and ABO certified opticians can fit anybody properly. When you receive your eye examination and you purchase your eyewear from Dr. Harger's optical, all aspects of your vision and glasses are warranted. Should you have any problems seeing through your new glasses, then Dr. Harger and his staff will determine the cause and correct it. If you buy your glasses elsewhere, then you are responsible for obtaining any warranty work on your eyewear. OPHTHALMIC LENSES Lens Designs: Eyeglass lenses can be separated into two (2) major types; they are either Single Vision Lenses or Multifocal Lenses. Single Vision Lenses have the same focus power everywhere in the lens. These lenses are used to correct hyperopia, myopia, or astigmatism. Dr. Harger generally prescribes them for patients under the age of forty. Multifocal Lenses do not have the same focus power everywhere. Certain portions of the lens are designed to focus at distance while other areas are designed for focus at near, or at intermediate distance. Common types of multifocal lenses are: 1) Bifocal - two focal lengths (one visible line) 2) Trifocal - three focal lengths (two visible lines) 3) Quadrafocal - four focal lengths (three visible lines) 4) PAL'S or Progressive Addition Lenses - these lens have many focal lengths and do not have any visible lines. Multifocal lenses are usually prescribed for patients age forty or older, but many children also need this lens for their schoolwork. These lens also correct myopia, hyperopia, astigmatism, and presbyopia. LENS MATERIALS Eyeglass lenses have traditionally been made from either glass or CR-39 plastic. Due to improved chemical processing and manufacturing techniques, newer and better eyeglass materials are now available. 1) Glass - Used for centuries! Excellent scratch resistance but fragile. Glass lenses are about twice as heavy as plastic lenses. Very resistant to most chemical solvents and good stable optical properties. 2) CR-39 Plastic - Used for ophthalmic lenses since the late 1940's. Good optical properties, about half the weight of glass, much stronger than glass but easily scratched if not protected by a scratch resistance coating on both sides. 3) Polycarbonate - Used since the 1980's. Very strong! About seven times more impact resistant the plastic lenses. Excellent Lens of choice for children, teens, sport, and safety related eyewear. They block UV radiation, and have a factory applied scratch resistance coating on both the front and back surfaces of the lens. 4) Hi-Index Plastic - Used since about 1985. Very good optical properties but higher in cost than polycarbonate. Lens thickness is slightly greater than polycarbonate but thinner than CR-39. Used mainly for aspheric lenses marketed as "thin & Light" or smiliar lenses. LENS COATING & TINTS 1) Scratch resistance coatings are recommended for CR-39 plastic lenses. Most Hi-Index plastic lenses have a scratch resistance coating applied during manufacture. The new tough coatings are greatly improved over prior coating technology. 2) UV-400 - A clear coating applied to both surfaces of plastic lenses that blocks ultra-violet light waves. For children's eyewear, for sunwear, and for patients who have had cataract surgery, most eye doctors require this UV protection. UV exposure causes cataracts and retina degeneration. 3) Multiband anti-reflective coating is recommended for most general-purpose clear eyeglass lenses. It reduces glare, improves you night vision, decreases eyestrain and fatigue associated with computer screen usage, and improves both the optical characteristics and appearance of your glasses. Extra care must be used when cleaning A/R coated lenses to prevent lens damage and prevent scratching the lens. 4) Tints are usually applied to CR-39 plastic or Hi-Index plastic lenses. All tinted plastic lenses fade with exposure to sunlight. Polycarbonate lenses are difficult to tint very darkly. Tints can not be added to glass lenses after they are made; color must be added during the smelting stage of making the glass. 5) Polarized lenses are made by sandwiching a polarized film between two thin lenses. These are the lenses of choice for fisherman, boaters, and most driving conditions. These lenses are extremely fade resistant.

 
 

M.L. Harger, O.D.

Jerrad Mills, O.D.
2009 Center Street
Deer Park, Texas 77536
Ph 281-479-4570
Pg 281-661-9037
Fx 281-479-7895

Email dpvc@sbcglobal.net

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Deer Park Texas