In nuclear cataract and cortical cataract, the enzyme activity pattern of the cortex shows slight alterations, indicating a change in the protein composition. The ATP content of these lenses is high as well as that of fructose. These data indicate a relatively high amount of metabolically active tissue. Subcapsular cataracts do not show significant alterations of the cortical enzyme pattern, but the low content of ATP and fructose indicates a decrease of metabolically active tissue, compared to lenses without opacities in the superficial cortex. In fully opaque lenses, the distortion of the cortical enzyme activity pattern and the low ATP and fructose content indicate a marked decrease of metabolically active tissue. The high glucose content is explained by an increase of the extracellular space, while the unaltered enzyme activity pattern of the epithelium and the high ATP/ADP ratio lead to the assumption that the lens epithelium survives even in early stages of full opacification of the lens.
Thirty-nine patients with convergent microstrabismus and 24 patients with central organic scotoma underwent measurements of stereo acuity. Stereopsis at distance was measured by means of a polarization haploscope using "plane-tests" and random dot tests respectively. For near stereopsis were used commercially available tests (Titmus Test, TNO-Test). Organic scotomata can be divided into "circumscribed central scotomata" and "sievelike scotomata", the latter leading to poorer performance in random dot tests. Large plane tests yielded better results than small ones. In microstrabism we found stereo acuities similar to those of patients with "sievelike scotoma". The results support the theory of displacement of fusion within Panum's area in microstrabismus leading to decreased local stereopsis due to decreased concentration of stereo units at the border of Panum's area.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.