Results 211 to 220 of about 9,226 (246)
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Clinical norms for amplitude of accommodation in Chinese
Ophthalmic and Physiological Optics, 1993Amplitude of accommodation was measured in 121 Hong Kong Chinese subjects between the ages of 11 and 65 years, using the ‘push‐up’ method and the results compared with those previously obtained for Caucasian subjects. The results confirm and quantify clinical experience that Chinese people have lower amplitudes of accommodation than Caucasians.
M H, Edwards +4 more
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Repeatability of clinical measurements of the amplitude of accommodation
Ophthalmic and Physiological Optics, 1996Summary In order to determine whether a significant change has occurred in a clinical parameter, it is essential to assess the repeatability of the measurement procedure. Accordingly, the present study has examined the repeatability of three techniques for evaluating the subjective amplitude of accommodation.
M, Rosenfield, A S, Cohen
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Critical Subjective Measurement of Amplitude of Accommodation
Optometry and Vision Science, 1994ABSTRACT The use of fixed print size to measure amplitude of accommodation by the push‐up method will result in a range of angular sizes of the print at the nearpoint for patients with different amplitudes. We investigated the effect of this on measured amplitude of accommodation in 60 subjects aged 25 to 45 years.
Atchison, David A. +2 more
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Is Myopia Related to Amplitude of Accommodation?
American Journal of Ophthalmology, 1997To report the association between amplitude of accommodation and refractive error.Refractive error and amplitudes of accommodation were measured in 1,148 eyes of 696 patients as part of the Early Treatment Diabetic Retinopathy Study.Eyes with myopia, defined as those with a refractive error of -0.75 diopter or more, have lower accommodative amplitudes (
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Effect of timolol on the amplitude and dynamics of accommodation
Documenta Ophthalmologica, 1989There is still debate about whether the ciliary muscle is innervated by the sympathetic nervous system. We investigated the amplitude and the dynamics of accommodation under influence of the non-selective beta-blocker timolol. For this purpose the variations in thickness of the human lens during step-like changes in accommodation were measured with ...
J, Weber +2 more
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AMPLITUDE OF ACCOMMODATION: POPULATION AND METHODOLOGICAL DIFFERENCES
Ophthalmic and Physiological Optics, 1986A literature survey of amplitudes of accommodation in various countries is presented. Results of push‐up and minus‐lens determination of 447 patients in Nigeria are compared with previous results. A smaller decrement in amplitude due to temperature than previously accepted is suggested.
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Comparing the Amplitude of Accommodation Determined Objectively and Subjectively
Optometry and Vision Science, 1993ABSTRACT The purpose of this study was to determine if differences exist between subjective and objective methods of measuring the amplitude of accommodation. In a double‐masked study on 57 patients, ages 6 to 35 years, 2 examiners measured the amplitude, 1 using the subjective push‐up method and the other using a modified form of ...
R P, Rutstein, P D, Fuhr, J, Swiatocha
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On the relationship between lens stiffness and accommodative amplitude
Experimental Eye Research, 2007The purpose of this study was to investigate the relationship between the stiffness of the material comprising the lens and the loss of accommodative amplitude with age. We used a validated mechanical model to determine the changes in the shape of the lens during accommodation and disaccommodation. The relative contribution of lens stiffness to loss of
Henk A, Weeber, Rob G L, van der Heijde
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Accommodative amplitude required for sustained near work
Ophthalmic and Physiological Optics, 2011Citation information : Wolffsohn JS, Sheppard AL, Vakani S & Davies LN. Accommodative amplitude required for sustained near work. Ophthalmic Physiol Opt 2011, 31 , 480–486 ...
James S, Wolffsohn +3 more
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Behavioral measurements of accommodative amplitude in rhesus monkeys
Vision Research, 1984The extent of voluntary accommodation was investigated behaviorally in two young rhesus monkeys and an adult human using a modified minus-lens technique. Specifically, contrast sensitivity for a high spatial frequency grating was determined as a function of spectacle lens power.
E L, Smith, R S, Harwerth
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