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^ Fabry's disease Rare X-linked recessive inherited lysosomal storage disease with multiple possible system disorders including optic neuropathy.
^ Field, Receptive see Centre Surround
^ Field, Visual see Visual Field
^ Flavonoid
^ Flavone
^ Flicker A type of light stimulus
^ Fovea Retinal area at the posterior pole of the eye, seen with an ophthalmoscope as a red spot, where circuitry for central vision is located. This area is packed with cones in a hexagonal pattern of maximum density. It is devoid of blood vessels, getting its nutrients from the choriocapillaris behind it via transport through Bruch's Membrane. The central foveal pit, 200 microns across, is made almost entirely of cones with the rest of the inner retinal layers displaced laterally along the foveal slope into a foveal rim or parafovea. The parafovea has six layers of ganglion cells making this area the thickest part of the retina. Together with the surrounding perifovea, and the xanthophyll carotenoid pigment of cone axons in this area, all these structures are seen as the Macula Lutea with an ophthalmoscope.
^ Founder effect
^ Free Radical see Radical, Free
^ Friedreich's Ataxia
^ Fundoscope or Funduscope An instrument used to look at the back of the eye (ocular fundus) through the pupil. One function of an ophthalmoscope.
^ Fundus, Oculi
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