Jan 18 2010
The Eye Doctors dictionary for Contact Lenses

If you’re not sure what some of the most popular Contact Lens words are, look over our short dictionary of eye terms.
Astigmatism
This is where the cornea is irregularly shaped, which prevents the focusing of light rays. This means near and distant objects appear blurred or distorted. A Toric (gas permeable and soft lenses) can correct astigmatism and the best contact lens for the condition
Age-Related Macular Degeneration (AMD):
An eye condition in later life when the center of the retina is slowly damaged, affecting central vision..
Cornea
Part of the eye’s focusing system that transmits and focuses light into the eye.
Cataracts
Cataracts cause clouding of the eye lens which means light cannot get through to the retina.
Contact Colour Lenses
Contacts that change or enhance your natural eye colour. Even with the best contact lens, you will still need a prescription.
Disposable Contact Lenses
Contact lenses that are worn and then thrown away after a specific time.
Daily Contact Lens
Contact lenses that you wear during waking hours but remove at the end of each day for cleaning.
Extended Wear Contact Lenses
Contact lenses that are worn all the time for a 1 to 30 days/nights period.
Frequent/Planned Replacement Contact Lenses
These lenses can be worn on a daily basis with cleaning , rinsing and disinfection each time the lens is removed. The lenses are then thrown away after the recommended wearing period. The best contact lens are made of silicon hydrogel, making them easy and comfortable to wear
Gas Permeable (GP) Contact Lenses
A type of contact lens that is made of a breathable, firm, durable, plastic that is custom fitted to the shape of the cornea.
Hard Contact Lenses
The first type of contact lens, which was made of an inflexible plastic material. They provided excellent vision correction, but the hard lenses did not allow the essential oxygen through the lens to reach the cornea.
Hyperopia (or Farsightedness)
Because the eye is too short and flat, the light rays can’t focus and near objects appear blurred
Macula
The part of the eye responsible for detailed central vision.
Myopia (or Nearsightedness)
With Myopia the eye is too long and steep, which means you can’t see distant objects clearly.
Optic Nerve
The nerve at the back of the eye
Ophthalmologist
A medical doctor (MD) who specializes in diagnosing and treating eye disorders.
Optician
A Specially trained professional (not a medical doctor or optometrist) who can write prescriptions for corrective vision by ophthalmologists and optometrists.
Optometrist
A doctor of optometry (OD) examine eyes for vision and health problems, and prescribe and fit contact lenses.
Presbyopia
An eye condition in later life when the eye become less flexible, causing blurred vision at reading distance. The best contact lens corrects this with bifocal or multifocal contact lenses.
Retina
The light-sensitive layer of tissue that lines the inside of the back of the eye.