. Good and bad eyesight : and the exercise and preservation of vision. in which the two parts are connected only by a rivet,which should be sufficiently tight to give them a gripupon the nose; and those like Fig. 55, in which thetwo parts are connected by a spring. Those like , are known by makers as the English pattern, in op-. position to Fig. 56, in which there are additional piecesto keep the lenses farther away from the sides of thenose, and which is known as the Japanese are commonly made of steel, aluminium, gold,or tortoiseshell; and the English pattern maybe fram
. Good and bad eyesight : and the exercise and preservation of vision. in which the two parts are connected only by a rivet,which should be sufficiently tight to give them a gripupon the nose; and those like Fig. 55, in which thetwo parts are connected by a spring. Those like , are known by makers as the English pattern, in op-. position to Fig. 56, in which there are additional piecesto keep the lenses farther away from the sides of thenose, and which is known as the Japanese are commonly made of steel, aluminium, gold,or tortoiseshell; and the English pattern maybe frame- PRACTICAL HINTS ON SPECTACLES. 249 less, the handle and the connecting spring being rivetedinto holes drilled through the lenses. There are variousunimportant modifications of these patterns, and thereare also mounts which are something intermediate be- Fig. 54. Fig. 55.
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Keywords: ., bookcentury1800, booksubj, booksubjecteye, booksubjecteyediseases
