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  Indian J Med Microbiol
 

Figure 2: Structural grading system of foveal hypoplasia using cross-sectional optical coherence tomography images after Thomas et al.[30] (a) Grade 1, a shallow foveal pit and presence of outer nuclear layer and outer segment in the fovea. (b) Grade 2, absence of foveal pit. (c) Grade 3, absence of outer segments lengthening. (d) Grade 4, absence of outer nuclear layer widening. (e) Atypical form of foveal hypoplasia with disruption of the inner and outer segments of photoreceptor, a sign of photoreceptor degeneration. Grades 1 and 2 represent deficient foveal pit formation without affecting the cone specialization while Grades 3 and 4 represent a failure in the cone specialization

Figure 2: Structural grading system of foveal hypoplasia using cross-sectional optical coherence tomography images after Thomas <i>et al</i>.<sup>[30]</sup> (a) Grade 1, a shallow foveal pit and presence of outer nuclear layer and outer segment in the fovea. (b) Grade 2, absence of foveal pit. (c) Grade 3, absence of outer segments lengthening. (d) Grade 4, absence of outer nuclear layer widening. (e) Atypical form of foveal hypoplasia with disruption of the inner and outer segments of photoreceptor, a sign of photoreceptor degeneration. Grades 1 and 2 represent deficient foveal pit formation without affecting the cone specialization while Grades 3 and 4 represent a failure in the cone specialization