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Ocular straylight is a phenomenon where parts of the eye scatter light, creating glare. It is analogous to stray light in other optical systems; scattered light reaches the retina but does not contribute to forming a correct image. One can observe the effect of straylight by looking at a distant bright light source against a dark background. If the source is small, it would look like a small bright spot if they eye imaged it perfectly. Scattering in the eye makes the source appear spread out, surrounded by glare. The disability glare caused by such a situation has been found to correspond precisely to the effect of true light.〔Vos JJ. "Disability glare - a state of the art report". ''Commission International de l'Eclairage Journal''. 1984;3/2:39-53〕 As a consequence, disability glare was subsequently defined by this true light, called "straylight".〔 == Individual differences == Straylight can differ considerably between individuals. Aging of the crystalline lens of the human eye causes straylight to become worse.〔Van den Berg TJTP et al. "Straylight effects with aging and lens extraction". ''Am J Ophthalmol.'' 2007;144:358-363〕 Lens extraction and artificial lens implantation is an effective treatment. Less common causes for straylight include: *Diseases of the cornea, e.g. Fuchs' dystrophy.〔Van der Meulen IJ et al. "Quality of vision in patients with Fuchs Endothelial dystrophy and after DSEK". ''Arch Ophthalmol'' 2011〕 *Lack of pigmentation, e.g. albinism.〔Kruijt B et al. "Ocular straylight in albinism". ''Optom Vis Sc'' 2011;88:E585-E592〕 *Laser refractive surgery, with occasional haze formation.〔Van Bree MC et al. "Straylight values after refractive surgery". ''Ophthalmology'' 2011;118:945-953.〕 *Excessive floaters in the vitreous humour.〔Mura M et al. "Surgery for floaters". ''Ophthalmology'' 2011;118:1894〕 *Contact lenses.〔Van der Meulen IJ et al. "Straylight measurement in contact lens wear". ''Cornea'' 2010;29:516-522〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ocular straylight」の詳細全文を読む スポンサード リンク
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