Anatomy and physiology of the eye, with hints for the preservation of the eyesight (1901)
Herbert, John Frederick, 1860- · Philadelphia, Pa., The author · leaf 34
s of rays, whichwould otherwise come together behind the retina and notproduce a ])roper focus. 28 THE EMMETROPIC OR NORMAL EYE. When an eye is in a state of rest—that is, when the cil-iary nmscle is relaxed to its fullest extent and the accom-modation suspended—the rays emanating from a… … Figure 15.Parallel rays focus directly on the retina at F. the retina, thus producing a perfect and distinct imagewithout any artificial aid, we have a Normal Eye. The emmetropic eye is usually about one inch long inits anteroposterior diameter, 5et it ma} be either longer orshorter and still be…
Eye · Lenses
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