Foveal
The foveal system of the human eye is the only part of the
retina that permits 100% visual acuity. Theline of sight is a virtual line connecting thefovea with afixation point in the outside world.The discovery of the line of sight is attributed to Leonardo DaVinci. [LEONARDO DAVINCI (1955), das Lebensbild eines Genies, Emil Vollmer Verlag, Wiesbaden Berlin. Dokumentation der DAVINCI Ausstellung in Mailand 1938, p. 430; cited in 'Hans-Werner Hunziker, (2006) Im Auge des Lesers: foveale und periphere Wahrnehmung - vom Buchstabieren zur Lesefreude' [In the eye of the reader: foveal and peripheral perception - from letter recognition to the joy of reading] Transmedia Stäubli Verlag Zürich 2006 ISBN 978-3-7266-0068-6]
His main experimental finding was that there is only a distinct and clear vision at the
line of sight , the optical line that ends at thefovea . Although he did not use these words literally he actually is the father of the modern distinction between "foveal vision" (a more precise term for central vision) andperipheral vision .Leonardo DaVinci , (1452-1519) was the first in Europe to recognize the special optical qualities of the eye. He derived his insights partly through introspection but mainly through a process that could be described as optical modelling. Based on dissection of the human eye he made experiments with water-filled cristal balls. He wrote "The function of the human eye, ... was described by a large number of authors in a certain way. But I found it to be completely different."The modern diagram to the right shows that the
fovea is a sort of "pit". The Latin word "fovea" actually means "pitfall": a pitfall for catching something by sight.References
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fovéal — fovéa [ fɔvea ] n. f. • 1900; du lat. sc. fovea centralis « fosse centrale » ♦ Anat. Dépression médiane de la tache jaune (« macula lutea »), au centre de la rétine, zone où la vision est la plus nette. Adj. FOVÉAL, ALE, AUX . fovéal, ale, aux… … Encyclopédie Universelle
foveal — adjective see fovea … New Collegiate Dictionary
foveal — See fovea. * * * … Universalium
foveal — adjective Of or pertaining to the fovea … Wiktionary
foveal — fo·ve·al … English syllables
foveal — … Useful english dictionary
foveal vision — tiesioginis regėjimas statusas T sritis fizika atitikmenys: angl. direct vision; foveal vision vok. direktes Sehen, n; foveales Sehen, n rus. прямое зрение, n; фовеальное зрение, n pranc. vision directe, f; vision fovéale, f … Fizikos terminų žodynas
foveal reflex — the dotlike reflex of light caused by the foveola retinae, seen during ophthalmoscopy … Medical dictionary
foveal vision — central v … Medical dictionary
foveal vision — noun vision with the fovea • Hypernyms: ↑daylight vision, ↑photopic vision … Useful english dictionary
