By J. L. C. Martin-Doyle and Martin H. Kemp (Auth.)
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Additional info for A Synopsis of Ophthalmology
Unfortunately, it frequently happens that they cannot be worn for long at a time. c. Modern operative treatment consists in removing the entire central area of the cornea and replacing it with a penetrating donor graft (see p. 227). 2. Megalocornea (and Keratoglobos): A bilateral hereditary enlargement of the cornea which affects males only and, unlike buphthalmos, is not associated with increased tension or cupping of the disc. It is a congenital overgrowth and does not normally affect vision.
CILIARY MUSCLE: A few unstriped muscle fibres are found in the epichoroid near the equator. These increase greatly in the ciliary region both in number and size. Three distinct series of muscle fibres are present: 1. MERIDIONAL FIBRES lie most externally and are attached to the scleral spur—sometimes called the 'tensor choroideae'. When these fibres contract they pull on the scleral spur and exert a pumping action on the canal of Schlemm. 2. RADIAL FIBRES are internal and anterior. With them is the connective tissue forming the basis of the iris.
4. Marginal Atrophy: A rare degeneration found in old people. A 'gutter' forms in the region of the arcus senilis, and if the gutter deepens ectasia will result and Descemet's membrane may rupture. The gutter is formed by the absorption of the fat present in the arcus senilis. The disease may be bilateral. 5. Pannus Degenerativus: This occurs in degenerate blind eyes and develops between Bowman's membrane and the epithelium. It is a granulation tissue which spreads inwards from the limbus, and at a later stage fibrous and hyaline changes occur and the epithelium becomes thickened.
A Synopsis of Ophthalmology by J. L. C. Martin-Doyle and Martin H. Kemp (Auth.)