The attractiveness of contact lenses remains to improve with the growth of technologically advanced methods for vision correction and for proper handling and maintenance of lenses. They are particularly effective in certain occupations, and are desirable for cosmetic reasons in many others.
However, there are many individuals for whom contact lenses should not be recommended; all potential candidates should be thoroughly screened by an ophthalmologist.
Medical conditions in which corneal lenses are recommended include absence of lens or aphakia, absence of iris or aniridia, congenital absence of pigment, myopia and hyperopia, some types of astigmatism, cone-shaped deformity of the cornea or better known as keratoconus, and turned-in eyelashes.
Contraindications include allergic and inflammatory conditions (such as corneal infection), abnormal overflow of tears (epiphora), presbyopia, severe exophthalmus, pterygium, or local neoplasm.
The Structure
The corneal lens is made of lightweight, paper-thin plastic about 10 mm. or less in diameter. Scleral lenses are larger and are used for special medical conditions and some sports.
When...
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