The Illustrated Optical Manual, or Handbook of Instructions for the Guidance of Surgeons in Testing Quality and Range of Vision, and in Distinguishing and Dealing with Optical Defects in General
The Illustrated Optical Manual, or Handbook of Instructions for the Guidance of Surgeons in Testing Quality and Range of Vision, and in Distinguishing and Dealing with Optical Defects in General
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. 1888 Excerpt: ...and the images are homonymous, there is convergent displacement, and the external rectus muscle is affected; if crossed, there is divergent displacement, and the internal rectus muscle is affected. The frequent associations of convergent strabismus with hypermetropia, and of divergent strabismus with myopia, have been ...
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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. 1888 Excerpt: ...and the images are homonymous, there is convergent displacement, and the external rectus muscle is affected; if crossed, there is divergent displacement, and the internal rectus muscle is affected. The frequent associations of convergent strabismus with hypermetropia, and of divergent strabismus with myopia, have been already remarked on in the sections on these refractive conditions. Concomitant Strabismus.--Concomitant strabismus may be only occasional or it may be persistent. The deviation may alternate between the two eyes, each in turn being capable of directing its visual line on the object while the other deviates; or one, or both eyes, may be permanently displaced. When the deviation alternates between the two eyes, the amount of deviation in the right eye when the visual line of the left eye is directed upon the object looked at will be equal to that of the deviation in the left eye, when the macula lutea of the right eye is in line with the object. In the strabismus of muscular paralysis the loss of power of the eye to move in the line of impaired, or lost, action of the paralysed muscles and the deviation in the opposite direction are constant. When the strabismus exists only to a moderate amount, and the deviation is limited to one eye, it is sometimes not easy of detection so long as the two eyes are observed together. But it may usually be readily demonstrated, if the retinal functions of the two eyes are preserved, in the following way. The person under observation is directed to regard an object at the distance of a few feet in front of him. Each eye is then alternately covered by the hand of the observer. When the eye whose visual line is directed to the object is covered, the squinting eye may be noticed at once to change its position. It ...
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Add this copy of The Illustrated Optical Manual, Or Handbook of to cart. $52.18, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2010 by Nabu Press.
Add this copy of The Illustrated Optical Manual, Or Handbook of to cart. $59.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
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