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August 1943


Author Affiliations

From the Division of Physiology of the University of California Medical School.

Arch Ophthalmol. 1943;30(2):247-249. doi:10.1001/archopht.1943.00880200095011

There has been a very great deal written, dating from the time of Dobrowolsky (1885), but more especially within recent years, about the so-called dynamic lenticular astigmatism or astigmatic accommodation. There is, however, no scientific foundation for the claim that the accommodative effort of the ciliary muscle deforms the lens unequally on different meridians . . . all the evidence goes to show that if any part of the ciliary muscle contracts in life, it contracts equally all round.1

Contrary to this statement of Duke-Elder, there is at least one report in the literature showing that astigmatic accommodation is a possibility. Grossman2 found that in the cat physostigmine caused more active positive accommodation in the vertical meridian, by 5.00 D., than in the horizontal meridian.

Since 1939 we have been investigating the nervous control of accommodation.3 During this time we have refracted the eyes of several hundred animals under different