Search results
Results from the WOW.Com Content Network
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.
Perimetry more carefully maps and quantifies the visual field, especially at the extreme periphery of the visual field. The name comes from the method of testing the perimeter of the visual field. Automated perimeters are used widely, and applications include: diagnosing disease, job selection, visual competence assessment, school or community ...
The visual field is "that portion of space in which objects are visible at the same moment during steady fixation of the gaze in one direction"; [1] in ophthalmology and neurology the emphasis is mostly on the structure inside the visual field and it is then considered “the field of functional capacity obtained and recorded by means of perimetry”.
Confrontation visual field testing is an important part of a routine ophthalmological or neurological examination. It can be used for rapid and gross assessment of large-scale visual field problems due to ophthalmological or neurological diseases, such as homonymous and heteronymous hemianopias, quadranopsia, altitudinal visual loss, central/centrocecal scotoma etc. [1] [2] Test using a red ...
It is a diagnostic tool that aids in the detection of visual disturbances caused by changes in the retina, particularly the macula (e.g. macular degeneration, Epiretinal membrane), as well as the optic nerve and the visual pathway to the brain. Amsler grid usually help detecting defects in central 20 degrees of the visual field. [2]
These receptive fields were called simple cell receptive fields, and were believed consist of single center-surround LGN input. [ 1 ] A theoretical analysis of how the orientation selectivity of simple cells and complex cells in the primary visual cortex relate to inherent properties of visual receptive fields is given in. [ 4 ]
Start a discussion about improving the Humphrey visual field analyser page Talk pages are where people discuss how to make content on Wikipedia the best that it can be. You can use this page to start a discussion with others about how to improve the " Humphrey visual field analyser " page.
Harry R. Humphries (born November 17, 1940) is a former United States Navy SEAL who currently works as a consultant and actor in Hollywood films. After graduating from Admiral Farragut Academy and attending Rutgers University in New Jersey, Humphries joined the Navy where he was assigned to UDT 22 and SEAL Team 2.