Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 SPECUL SENSES 555^ the line a b. This'lateral movement amounts to a c, to , and we have 2 merely to double this result in order to obtain the actual size of the image on the cornea or lens. If the lens l)e now cut out of the e^ye, it is found when freed from its supporting structures that the curvature of its anterior surface is much greater than it was before. It is evident that a pressure is normally exerted by some struc- ture on the anterior surface of the lens, repressing its natural t
Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 SPECUL SENSES 555^ the line a b. This'lateral movement amounts to a c, to , and we have 2 merely to double this result in order to obtain the actual size of the image on the cornea or lens. If the lens l)e now cut out of the e^ye, it is found when freed from its supporting structures that the curvature of its anterior surface is much greater than it was before. It is evident that a pressure is normally exerted by some struc- ture on the anterior surface of the lens, repressing its natural tendencj^ to become convex. If we examine sections Fig. 247. Diagram to illustrate principle ol ophthalmometer (after Schenck). through the eye we lind that this structure is the suspensory ligament of the lens. The membrana hj^aloidea of the vitreous is thickened in front and closely adherent to the ciliary processes. At the margin of the lens it divides, sending a thick tough expan- sion forwards to cover the anterior surface of the lens, and a thin expansion behind which separates the lens from the vitreous humour. The part of the membrane extending from the edge of the lens to the ciliary processes is the suspensory ligament. This ligament is normally on the stretch, and keeps the anterior surface of the lens nearl}'
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