This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1869 Excerpt: ...correspond to the inclination of the affected bacilli, b and b', to the radii b c and b' c'. Every point in the lines b l and b' l would appear to be in the frontal axis A L, and the points lying in each of the two lines would therefore coincide. Fig. 59. Fig. 60. Next, let the object l appear double to a pair of eyes ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1869 Excerpt: ...correspond to the inclination of the affected bacilli, b and b', to the radii b c and b' c'. Every point in the lines b l and b' l would appear to be in the frontal axis A L, and the points lying in each of the two lines would therefore coincide. Fig. 59. Fig. 60. Next, let the object l appear double to a pair of eyes convergent towards the point D; and let it be seen (Fig. 59) by the eye B at M, and by the eye B' at M'. If we draw from L, through the ocular centres c and c', the rays L b and L b' and through the affected points of the retinae b and b', the lines b e and b ' e' parallel to A M and A M'; then these lines show the directions of the affected bacilli, and e b L and e' b' L are the angles of application. All points on the line b l would appear to be in the direction A M; and all points on the line b' l would appear in the direction A M'. Again, let the two objects L and if (Fig. 60) appear blended, at the point M of the frontal axis, to the pair of eyes convergent upon the point D. If we draw from L and i/ through the ocular centres c and c', the rays L b and L' b', and through the affected points of the retina; b and b', the lines b e and b' e' parallel to the frontal axis A M, then e b L and e' b ' L' will be the angles of application. All points on the lines b h and b ' i! would appear to be in the frontal axis, and would coincide. UNILATERAL OCULAR DEFECTS. With regard to any of the already described defects of accommodation, convergence, and application, it may happen that both eyes are not alike; so that any one of the already-mentioned 729 conditions of the left eye may coexist with any one of these conditions in the right. This gives 729 x 729 = 531,441 possible states of the binocular organs of vision, of which one is normal, and the ot...
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