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12 Cards in this Set

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  • Back

The base curve of a certain contact lens is equal to 7.5 mm radius of curvature. The equivalent power in diopters is?

45.0 Diopters

When moved 5 mm from its original position the effective power of a 10 D lens will change

0.50 Diopters

Another name for a scleral lens?

Haptic lens

PMMA lenses were first invented by who and when?

Kevin Touhy 1947

CAB- cellulose acetate butyrate was first utilized as a contact lens when?


HEMA- Hydroxyethylmethacrylate is referred to as what type of lens? When was it FDA approved?

Soft lens FDA approved 1971

The base curve is also known as?

The central posterior curve (CPC) or the primary base curve

Where is aqueous fluid created?

Name a mineral in it?

It is secreted by the lacrimal glands. Contacts ions and minerals such as sodium and potassium.

What is the primary function of the lipid layer of the tear film? What produces lipid film?

Prevent evaporation of the tear film. Produced by the meimbomian glands.

What is the primary function of the mucoid layer of the tear film? What produces the mucoid layer?

Co convert the hydrophobic epithelial layer of the cornea to a hydrophilic surface. Produced by goblet cells.

B.U.T....tests for what?

Quality of tears

What is the rose bengal used for?

Colors degenerating and dead epithelial cells.