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Fluorescein angiography [1] (FA), fluorescent angiography (FAG), or fundus fluorescein angiography (FFA) is a technique for examining the circulation of the retina and choroid (parts of the fundus) using a fluorescent dye and a specialized camera.
The idea that fundus can and should correspond to a combining form fundo-drives the formation of an alternate form, fundoscopy (fundo-+ -scopy), which is the subject of a descriptive-versus-prescriptive difference in acceptance.
Medical signs that can be detected from observation of eye fundus (generally by funduscopy) include hemorrhages, exudates, cotton wool spots, blood vessel abnormalities (tortuosity, pulsation and new vessels) and pigmentation. [3] Arteriolar constriction, seen as "silver wiring", and vascular tortuosities are seen in hypertensive retinopathy.
The American Academy of Ophthalmology recommends comprehensive eye examinations, including dilated fundus examination, for asymptomatic patients without risk factors for eye disease at varying frequencies based on age: every 5–10 years in adults under 40 years, every 2–4 years in adults aged 40 to 54 years, every 1–3 years in adults aged ...
[9] [10] A fundus camera provides an upright, magnified view of the fundus. A typical camera views 30 to 50° of retinal area, with a magnification of 2.5x, and allows some modification of this relationship through zoom or auxiliary lenses from 15°, which provides 5x magnification, to 140° with a wide angle lens, which minifies the image by ...
For example, retinoblastoma, a neuroblastic tumor that can cause a dampened or even white reflex, occurs in 1 in every 20,000 children. [4] Regardless of the effectiveness, it is a fast, inexpensive , and noninvasive exam that could identify ocular pathology which with early identification can alter the course of the disease.
Lipaemia retinalis is a retinal disease caused by hypertriglyceridemia or chylomicronemia. [3] Depending on plasma triglyceride level, the retinal arteries, veins or occasionally the entire fundus may show creamy-white to salmon red discoloration. [ 6 ]
Figure 1 - Humphrey field analyser. Humphrey field analyser (HFA) is a tool for measuring the human visual field that is commonly used by optometrists, orthoptists and ophthalmologists, particularly for detecting monocular visual field. [1] The results of the analyser identify the type of vision defect.