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F前焦点H主点n结点F后焦点The reduced schematic eye: 1 principal plane(H)主点主点 1 single nodal point(n)结点结点 Simplify the optical system of eye 简化眼简化眼17mm22.5mmPower=60D Near point: 经过眼的调节所能看清楚的最近距离。经过眼的调节所能看清楚的最近距离。 Far point: : 无调节作用下所能看清楚的最远距离。无调节作用下所能看清楚的最远距离。 调节范围: : 远点与近点距离之差称为调节范围。远点与近点距离之差称为调节范围。调节范围 调节远点调节远点 调节近点调节近点 调节调节AccomodationReractive error Myopia myopia临床表现临床表现近视近视远点远点hyperopia远视远视 Regular astigmatism最大屈光力和最小屈光力主子午线相互垂直单纯近视散光单纯远视散光复性近视散光复性远视散光混合性散光圆锥角膜角膜斑翳多发性角膜异物分分类类散光散光Correction散光散光The loss of accommodation that comes with aging in all people.老视老视At about age 44-46 +1.50DAt about age 44-46 +1.50D; age 50age 50 +2.00D+2.00D; age 60 +3.00Dage 60 +3.00Dcorrectioncorrection: plus lens plus lens,bifocal lens, progressive multifocal lensbifocal lens, progressive multifocal lens弱视弱视William N. Clarke, MDWilliam N. Clarke, MD
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