Spectacles, and How to Choose Them: An Elementary Monograph (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from Spectacles, and How to Choose Them: An Elementary Monograph

For many years after this discovery, no special ad vancement was made, and the use of Spectacles remained confined to supplying the deficiencies of the eye couse quent on age. During the past half century, however, and especially during the last quarter, the subject has been carefully studied by men eminent in the known sciences. That use which was based on a simple acci dental discover has been supplanted by one controlled by unvarying laws solved by the higher mathematics. Opinions based on the knowledge of past years should be discarded. NO age is now necessarily implied by their use. They may be worn by anyone at some period of life, for one or more of the many affections to Which they give relief.

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