|
|
|
Language:
English
Español
Français
Deutscher
|
|
Eyeglasses
|
|
Glasses, first made by Roger Bacon in 1268, are now a common correction for vision problems. These problems include astigmatism, myopia, and hypermetropia
|
|
Contact lenses, first made by Adolf Fick in 1887 out of glass were used to correct irregular astigmatism. Kevin Tuohy developed the modern contact lens in 1948. It is made of plastic and rests on a cushion of tears. Now there are three types of contact lenses. The most comfortable is the soft contact lens made of bendable plastic. Hard contact lenses are made of rigid plastic that is quite uncomfortable, however hard lenses can correct vision problems. Lastly, there are gas permeable lenses. Just like its name, it lets gas or air through the lens.
|
|
Ocular Prostheses (Artificial Eyes)
|
|
Some patients must have an eye removed by an ophthalmologist, or others may have accidents so damaging, that the eye must be removed. After the eye is removed, an ocular implant is put in the area of the old eye to keep the structure of the hollow space. The implant is not to restore the natural appearance of the eye, since it is not visible. The artificial eye is used to replace the eye for aesthetic purposes. The new eye can be of wax, silicon, or acrylic. Or, it can be just a shell over the damaged eye.
|
|
Eye makers called ocularists can make the artificial eyes to match the appearance of the old eye. The problem is enabling natural movement of the eye. To fix this problem, scientists used the mineral in ocean coral known as hydroxyapatite. The reason for this is the substance has pores and is almost like bone. In this eye, the eye muscles can move the eye.
|
|
Home
Glossary
Messages
Interact
About Us
Resources
Links
