Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The right side of the figure represents the condition of the lens during ao commodation for a new object, and the left side when the eye is at rest. The letters indicate the same parts on both sides; those on the right side are marked with a stroke. A, left, B, right half of the lens: 0, cornea S, sclerotic; cs, canal of Schlemm; vk, anterior chamber J, iris; P, margin of the pupil V, anterior surface H, posterior surface of the lens; R, margin of the lens F, margin of the ciliary processes; A B, space between the two former; the line Z X indicates the thick ness of the lens during accommodation for a near object; Z Y the thickness of the lens when the eye is passive.
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