“F” selections in the Glossary of Terms for
Anatomy, Physiology & Pathology of the Human Eye

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see hyperopia

fibrosa, tunica
see tunica fibrosa

fibrous tunic
see tunica fibrosa

field, visual
see visual field

photopsia; the brief perception of light that is purely subjective and accompanies a pathological condition, especially of the retina or brain

muscae volitantes; bits of optical debris (such as dead cells or fibrils), usually in the vitreous humor, that may be perceived as spots before the eyes

fluorescein angiography
a procedure in which a fluorescent yellow dye, injected into the vein of an arm, circulates into the eye within a few seconds, at which time a sequence of retinal photographs detect pooling of the dye in a certain location or leakage of the dye outside of blood vessels, confirming some type of retinal disorder

focal length
the distance away from a lens at which an image focuses, when parallel light rays enter the lens; the inverse, in meters, of the dioptric power of a lens

hyperplasia of the lymphoid tissue within the conjunctival stroma; resemble “Rice-a-Roni” embedded in the inferior conjunctiva; seen primarily in adenoviral and chlamydial infections, as well as in toxic reactions

the portion of the conjunctiva forming the junction between the posterior eyelid and the eyeball

fovea centralis
fovea; a small shallow depression or pit at the center of the macula, caused by an almost complete absence of inner retinal layers, containing only cones (and no rods) and which affords the most acute vision

the center of the fovea

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