Ocular refraction and the shadow test . 1 Figure 103 {Continuedi ./ tage). II Y S 1 O L O G I C A I, OPTIC. Figure 103. {Continued). Diagram to explain conslruction of card-board model, to represent a section ot the eye sur-rounding the cornea; the pupil; and rays of light traversing two planes at right angles to eachother, and entering the eye. From card-board of fair weight, cut the two forms shown as Iand II, mark the dotted line X Y on one, the dotted line F X on the other. Cut out anotherform like III, laying off the circle P, and dotted lines A B and C D. With a sharp knifecut through th
Ocular refraction and the shadow test . 1 Figure 103 {Continuedi ./ tage). II Y S 1 O L O G I C A I, OPTIC. Figure 103. {Continued). Diagram to explain conslruction of card-board model, to represent a section ot the eye sur-rounding the cornea; the pupil; and rays of light traversing two planes at right angles to eachother, and entering the eye. From card-board of fair weight, cut the two forms shown as Iand II, mark the dotted line X Y on one, the dotted line F X on the other. Cut out anotherform like III, laying off the circle P, and dotted lines A B and C D. With a sharp knifecut through the dotted lines. Put the model together in the form shown by IIII. tion in every meridian, these rays are shown to converge, and focusupon the retina. The eye is supposed to be in a static condition, thatis, the accommodation is at rest, and the eye is focussed for its far 126 O C I I. A K K E F R A C T 1 O X . point. The dotted circle is supposed to pass through the optical cen-tre of the refracting system and its principal focus: the retina is seento be located at its principal focus.
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