An Introduction to the Study of the Optical Defects of the Eye, and Their Treatment by the Scientific Use of Spectacles (Classic Reprint) - Softcover

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Excerpt from An Introduction to the Study of the Optical Defects of the Eye, and Their Treatment by the Scientific Use of Spectacles

Strictly speaking, there Is no such thing In nature as parallel rays the nearest approach we have to it are the rays Of light we receive from the sun and the fixed stars. Practically, for our purpose how ever, we may consider rays of light parallel that are received by the pupil of the eye from objects that are twenty feet distant or any dis tance greater than that. Pencils of light from objects less than twenty feet distant are more decidedly divergent.

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