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A Schatzki ring or SchatzkiâGary ring is a narrowing of the lower esophagus that can cause difficulty swallowing (dysphagia).The narrowing is caused by a ring of mucosal tissue (which lines the esophagus) or muscular tissue. Schatzki ring or SchatzkiâGary ring is a narrowing of the lower esophagus that can cause difficulty swallowing (dysphagia).
Fick's phenomenon See Sattler's veil. jack-in-the-box phenomenon When wearing very high positive lenses (e.g. in aphakia) there exists an area in the periphery situated between the outer extent of the field seen through the lens and the field beyond the edge of the lens, which is not seen (ring scotoma).