The Use of Spectacles with Optical Instruments

Details The Use of Spectacles with Optical Instruments The Use of Spectacles with Optical Instruments

May 1913

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1913natur..91q.297r&link_type=abstract

Nature, Volume 91, Issue 2273, pp. 297 (1913).

Physics

Scientific paper

WITH reference to the inquiry in NATURE of May 1 (p. 215), the general rule in cases where a person using spectacles wishes to use an optical instrument is, that for telescopes and instruments used for distant objects, use the distance correction; for microscopes and instruments for near work, the near correction should be worn. Care should always be taken to use the centre of the spectacle lens. If no astigmatism is present there is generally sufficient focussing room to enable the observer to dispense with the spectacles. The most comfortable method is to have a cap made for the eyepiece of the instrument with a lens equivalent to that in the spectacle. This should be set as close to the eye-lens as possible, and in cases of astigmatism they should be marked so that the axis may be correctly set. Any good optician will do this at small expense.

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