British Contact Lens Association

Glossary

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1. Farsightedness

   Also called Hyperopia. This is a common condition where the length of the eye is too short, causing light rays to focus behind the retina rather than on it. Farsightedness results in blurred near vision.

2. Field of view

   The area that is visible through the lens of an optical system.

3. Flexible wear

   The intermittent use of contact lenses overnight or during sleep.

4. Fluorescein

   A fluorescent dye that is instilled in the eye to evaluate the fit of rigid lenses and to highlight corneal staining, abrasions, and other corneal pathology.

5. Fluorescein pattern

   The pattern formed by fluorescein-stained tears flowing under a rigid lens and observed with a Burton lamp or through the cobalt blue filter of a slit-lamp. This pattern shows the relationship between the lens and the cornea (where the lens makes contact and where there is clearance).

6. Frequent & planned replacement contact lenses:

   General term used to refer to contact lens regimens in which lenses are replaced on a planned schedule, usually bi-weekly, monthly or quarterly.