The student's guide to diseases of the eye . on (see p. 51), see any details of thefundus clearly, the patient is myopic (opacities ofthe media being, of course, excluded). This testisapplicable to all degrees of M., accommodation beingcompletely relaxed. 4. By retinoscopy (p. 55), the shadow obtained onrotating the mirror moves in the direction of rota-tion. The tests (1), (2), and (4) are, on the whole,most generally useful for beginners. In a large proportion of cases, the elongation ofthe eye causes atrophy of the choroid on the side ofthe optic disc next to the y. s. (the apparent innersi
The student's guide to diseases of the eye . on (see p. 51), see any details of thefundus clearly, the patient is myopic (opacities ofthe media being, of course, excluded). This testisapplicable to all degrees of M., accommodation beingcompletely relaxed. 4. By retinoscopy (p. 55), the shadow obtained onrotating the mirror moves in the direction of rota-tion. The tests (1), (2), and (4) are, on the whole,most generally useful for beginners. In a large proportion of cases, the elongation ofthe eye causes atrophy of the choroid on the side ofthe optic disc next to the y. s. (the apparent innerside in indirect examination).This atrophy gives rise to acrescentic patch (Fig. 102) ofyellowish-white or greyish co-lour, whose concavity is formedby the border of the disc, whilstits convex side curves ; it is known as a myo-pic crescent, also as a pos-terior staphyloma (p. 176),because it indicates a localisedbulging of the sclerotic (). It varies in size fromthe narrowest rim to an areaseveral times that of the disc,. FiGk 102.—Myopic cres-cent or small posteriorstaphyloma. (Weckerand Jaeger.) and may form zone entirely surrounding the disc (Fig. 103), insteadof a crescent; there may also be several spots of 278 ERRORS OF REFRACTION AND ACCOMMODATION
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