Glossary

Bifocals
Eyeglasses incorporating two different powers in each lens, usually for near and distant corrections.

Cornea
Transparent front segment of the eye that covers the iris, pupil and anterior chamber; provides most of an eye's optical power.

Non-Glare Coatings
A single or multi-layered application of magnesium fluoride to the surface of a lens reducing the amount of light normally reflected from the surface.

Ophthalmologist
An opthamologist is sometimes called an 'eye M.D.' because he or she is a medical doctor who specializes in eye and vision care. 'Eye M.D.s are specifically trained to provide the full spectrum of eye care, from prescribing glasses and contact lenses to complex and delicate eye surgery. Many eye M.D.'s are also involved in scientific research into the causes and cures for eye diseases and vision problems.'

Optician
An optician is a professional in the field of finishing and fitting eyeglass lenses, frames and contact lenses. An optician turns a doctor's prescription into glasses or contact lenses and may also dispense low-vision aids and artificial eyes. Rx Optical's opticians are unique in that they go through an optical training course at our Corporate Training Facility and are required to become certified by the American Board of Optometry.

Optometrist
Optometrists are state-licensed health care professionals who diagnose and treat eye health and vision problems. They prescribe glasses, contact lenses, low-vision rehabilitation, vision therapy and medications, as well as perform certain surgical procedures. They hold the doctor of optometry (O.D.) degree.

Photochromic Lenses
Lenses that darken when exposed to UV rays and lighten to almost clear when not in the sun.

Polycarbonate
Higher index lenses that are thinner and lighter; the most impact resistant lens.

Progressive Addition Lens
Type of multi-focal eyeglass lens designed so that power for near gradually increases from zero (in center) to maximum add (in lower portion) with no visible lines.

Scratch Resistant Coating (SRC)
Various materials bonded in thin layers to the surface of most types of plastic lenses to reduce susceptibility to scratching.

Single-Vision Lens
An ophthalmic lens designed to provide correction for distance prescriptions only distance. It is the standard lens prescribed for patients under 40.

Trifocal Lens
A multifocal, ophthalmic lens designed to provide correction for three viewing distances; usually for distance, near and intermediate corrections.

Ultraviolet (UV) Rays
Invisible rays from sunlight and some lamps; potentially harmful to eyes, especially related to the development of cataracts.