Measurement of amplitude of accommodation in young persons

Abstract

Background: The aim was to evaluate the amplitude of accommodation using test objects designed with constant angular size corresponding to 6/6 visual acuity. Methods: In total, 155 young volunteers with good ocular and systemic health aged between eight and 25years were recruited for the study. A push-up method was conducted, with the near-vision target having a set of Landolt's broken circles. The angular size of the circles corresponded to a 6/6 visual acuity for various distances from 5.0cm to 40cm. To ensure precision of the object size, the electron beam lithographic technique was applied. Results: A general trend in a reduction in amplitude with the progression of age is coincident with data from previous studies; however, the magnitudes of the volume of accommodation in our study are substantially lower. Conclusion: Test objects with constant angular size can increase the accuracy of 'push-up' accommodation measures.