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Drop ball test
| Глоссарий терминов и сокращений по оптическим линзам |
A low-velocity, impact resistant test, commonly using a solid steel sphere freefalling 50 inches. for a.n.s.i. z-80 standards, a 5/8 inch steel ball falling 50 inches; for a.n.s.i. z87standards, a 1-inch steel ball falling 50 inches.
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Drusen, английский
Tiny yellow or white deposits in the retina or optic nerve head.
Down bend, английский
The drop or downward bend of the tip end of a temple (earpiece) to fit over and around the ear; also known as the ear bend.
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