Category: F

A substance which dyes the tear fluid when instilled into the eye, and is used in evaluating the fit of a contact lens by virtue of the fact that it fluoresces under ultra-violet light. Dye used in ophthalmology to detect certain defects of the cornea (injuries and foreign bodies) and other abnormalities and to determine…

A scleral lens having a relatively shallow corneal vault and not requiring the use of an auxiliary solution, since the tear fluid fills the space between the lens and the eye.  

A scleral lens having a relatively deep corneal vault and requiring the use of an auxiliary solution.  

Meat or eggs raised under strict standards for animal health and welfare.  

Another name for the stress survival reaction that increases the heart rate and elevates blood sugar levels to produce more energy to prepare the body to face stress.  

Distance between a lens and the image. The linear distance between a point of reference, usually a principal point, of an optical system and the corresponding primary or secondary focal point. In optics, the distance from the lens to the point of focus of light rays passing through the lens. In the realm of optics,…

Cheeky little pieces of hair that like to “fly away” from the rest of your style, sticking up and destroying your look. Use a hair, holding, or shine spray to flatten them out.  

Coarse feed for livestock.  

Studies to gather data on the foods consumed by general populations, or specific groups among them, using such methods as weighment of foodstuffs used, recall by the housewife and the like.