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Preferential hyperacuity perimetry : ウィキペディア英語版
Preferential hyperacuity perimetry
Preferential hyperacuity perimetry is a psychophysical test used to identify and quantify visual abnormalities such as metamorphopsia and scotoma. It is a type of perimetry.
==Background==
Vision abnormalities such as metamorphopsia (distortions) and scotoma are symptoms of retinal diseases such as Macular degeneration. In advanced stages of the disease, photoreceptor cells may be irreversibly damaged. Hence,if not treated Macular degeneration may lead to blindness. Awareness to early changes in vision, especially in high risk patients, leads to early treatment (such as intravitreal injection of anti-VEGF factors, e.g. bevacizumab or ranibizumab) and prevents loss of vision. Because of complex brain mechanisms such as Filling-in, patients with small and peripheral defects in their vision are often unaware of such changes until late stages in the disease. Another problem is that minute visual aberrations can be normal and therefore should be distinguished from genuine visual abnormalities. Preferential hyperacuity perimetry (PHP) is a technology that bypasses Filling-in and quantifies the extent of visual abnormalities.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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