SUMMARY An electroretinographic (ERG) technique is described in which the relationship between scotopic b wave amplitude and stimulus light intensity is detennined. The relative amplitude of scotopic to photopic responses is assessed by means of red light and flicker. The method is applied to the detection of ERG abnormalities in heterozygotes for X-linked retinitis pigmentosa. These have been found in only a proportion of cases. The ERG results can be used to suggest the nature of the retinal abnormality.

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SUMMARY This paper reports 3 patients who presented with angle-closure glaucoma secondary to posterior scleritis. Differentiation from primary angle-closure glaucoma is important, as medical treatment is markedly different while surgical treatment is not required.Posterior scleritis is an uncommon eye condition with protean manifestations (McGavin et al., 1976; Watson and Heyreh, 1976;Cleary et al., 1975) (Fig. 2). Gonioscopy showed that the angle of the right eye was closed while the angle of the left eye was open and of normal width.Examination of the fundus after dilatation of the right eye revealed a localised choroidal detachment in the inferotemporal quadrant (Fig. 3) (Fig. 4a, b).The diagnosis of secondary angle-closure glaucoma was made for this patient because of the atypical history, unequal anterior chamber depths, and scleritis.