Anatomy and physiology of the eye, with hints for the preservation of the eyesight (1901)
Herbert, John Frederick, 1860- · Philadelphia, Pa., The author · leaf 31
laced inthis angle can be readily distinguished by an eye whichhas normal acuity of vision. The letter E at twelve feet is three times higher thanthe one of four feet. Should the object be brought nearer,the visual angle would be greater, and consequently alarger retinal image would be the… … Figure 13. Rij^lil half is represented as adjusled for distant vision,and left half for near vision. tinctl^^ If, however, the letter or object which, under therule can only l)e seen well at four feet, were removed totwelve feet, it would become too indistinct to recognize, asthe retinal image…
Eye · Lenses
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