. Pathology and bacteriology [electronic resource]. Ophthalmology; Eye; Eye; Bacteriology; Ophthalmology; Eye; Bacteriology; Eye. CYCLOPIA OR SYNOPHTHALMIA 15 All the structures in the eye may be single and the lenses alone show signs of union. The cornea and sclerotic may be single, but the iris, choroid, retina, lens and vitreous con- tained within them double (Figs. 4 and 5). The sclerotics on the inner side of each eyeball may be the only parts united. Two entirely separate eyes may He side by side in the same Fig. 7.—Human cyclops, showing the absence of convolutions and fissures
. Pathology and bacteriology [electronic resource]. Ophthalmology; Eye; Eye; Bacteriology; Ophthalmology; Eye; Bacteriology; Eye. CYCLOPIA OR SYNOPHTHALMIA 15 All the structures in the eye may be single and the lenses alone show signs of union. The cornea and sclerotic may be single, but the iris, choroid, retina, lens and vitreous con- tained within them double (Figs. 4 and 5). The sclerotics on the inner side of each eyeball may be the only parts united. Two entirely separate eyes may He side by side in the same Fig. 7.—Human cyclops, showing the absence of convolutions and fissures in the brain, the posterior part of the cerebrum is occupied by a large cyst (local hydrocephalus). The condition is due to an arrest in development of the anterior part of the neural tube. It has been shown that in certain species of fish cyclopia can be induced, almost at will, by subjecting their eggs to the action of various magnesium salts dissolved in sea water. ^ From these and other embryological experiments it seems probable that the original tissue from which the primary optic vesicles are formed is median and single, and that cyclopia is due to an arrest in the formation of the eyes whilst the elements from which they start are still in the median axis of the developing nervous system. This differs from the ^ C. R. Stockard. J. Exp. Zool., V, 1909, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Collins, E. Treacher (Edward Treacher), 1862-1937; Mayou, M. Stephen (Marmaduke Stephen), 1876-1934; Pyle, Walter L. (Walter Lytle), 1871-1921, editor; University College, London. Library Services. London : William Heinemann
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