Anatomy and physiology of the eye, with hints for the preservation of the eyesight (1901)
Herbert, John Frederick, 1860- · Philadelphia, Pa., The author · leaf 35
the media be correspondingly in-creased, and if it be the latter correspondingly lessened. 29 HYPERMETROPIC OR FAR-SIGHTED EYE. Hypermetropia caused by an anteroposterior shorteningof the globe, may be congenital or acquired. It is due toa faulty shape of the eyeball or to a too little strength… … Parallel rays coining to a focus behind the retina at F,Dotted line shows shape of normal eye. objects become blurred and cannot be distinctly seen with-out undue accommodative effort. The eyes cannot beused for any period of time without becoming much fa-tigued. The mu.scular effort to adjust the…
Eye · Lenses
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