HYPERMETROPIC SPECTACLES Russian patent published in 1994 - IPC

FIELD: medical engineering; ophthalmology. SUBSTANCE: essence of invention consists in that spectacles include optically transparent moulded monoblock frame with corrective portions, bridge and hinged ear sides. Upper and lower edges of frame are straight-lined. Lower edge is parallel to horizontal axis of frame and upper one slopes from bridge toward lower edge periphery. Vertical edges of frame are inclined toward bridge and lower edge. Ratio of bridge width to width of entire frame is 18 : 131, ratio of bridge thickness to frame periphery thickness is 5 : 3.5 (where hinges are positioned), ratio of upper edge angle of slope to angle of slope of side edge is 1 : 2.5 and ratio of bridge height to height of adjacent corrective portions is 23 : 22. EFFECT: more accurate correction of vision. 3 cl, 2 dwg