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[Aging changes in accommodation--comparison of subjective method with objective method].

We investigated age-related changes in accommodation of the human eye by measuring the subjective amplitude of accommodation with a Visual Display Terminals Accommodometer (Tokyo-Medical NP-200) and the objective amplitude with an Auto Refkeratometer (Canon, RK-1). The accommodative responses of 5 normal eyes of 5 subjects ranging from 29 to 32 years of age were measured with 6 different sizes of targets. A distinct tendency for the subjective amplitude of accommodation to increase was observed with the targets of larger sizes, but no definite tendency was found in the objective amplitude. The accommodative responses of 92 normal eyes of 92 subjects ranging from 15 to 58 years of age were measured. Both the subjective and objective amplitude of accommodation decreased with aging. In subjects under 44 years of age, the objective amplitude was 2.2-2.5D less than the subjective amplitude, but over 45 the difference between the subjective and objective amplitude was 1.2-1.4D.