charts are placed on the displays for the reading glasses. The charts have increasing sizes of print, and the purchaser of the reading glasses is instructed to stand approximately 14 inches (35.6 cm.) from the chart. When viewing the chart, the consumer will look at each line of print, an...
1.An RFID tag for use on eyeglass frames, wherein the eyeglass frame includes a pair of eye wires or rims surrounding and holding a pair of lenses in place in a front frame, a pair of end pieces that connect the pair of eye wires or rims, respectively, via a pair of hinges, respec...
Medical investigation130of a person can include determining visual acuity in each eye using the Snellen Chart, which consists of random letters of different sizes. The letters for normal vision (20/20) are ⅜-inch tall, viewed at 20 feet. ...
the widths of the front and back bottom portions centered on the groove are not processed into balanced optimum sizes, in the processed eyeglass lenses on which the V shapes and groove are formed, in the eyeglasses that processed lenses are inserted in the eyeglass frame, the edge thickness ...