Abstract

A fifteen year old cat was studied in a manner similar to and compared with a previous study on a series of young cats. The ciliary ganglion was stimulated electrically with various voltages and frequencies. Accommodative response of the eye to this electrical stimulation was measured with a Rodenstock Eye-Refractometer. No obvious differences could be found in the data from the aged cat when compared with that of the young ones. Although the amplitude of accommodation of the aged cat was somewhat lower than the mean amplitude of the young cats, it was not significantly so. The equivalent human age of the animal was estimated to be 75 to 90 years. At this age man has long since lost all power of accommodation.

© 1955 Optical Society of America

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