Abstract
Purpose: To estimate the possible physical and physiological changes in the optical system of the eye related to age over 40 years in normal presbyopic persons.Material and Methods: Sample of 20 subjects with presbyopia ages (40 – 45 years) was used as cases and other sample of 20 subjects from university student’s ages (20 – 25 years) was used for comparison. Typical measurement procedures for the two groups included: accommodation, pupil size, anterior corneal surface power, and refraction from both eyes in each subject.Results: T-test showed significant difference between the measurements of the two groups. The estimated changes from young age to presbyopic age demonstrated the amplitude of accommodation tends to decrease 0.27 D per year, the pupil size tends to become smaller 0.033 mm per year, the refraction tends to shift toward hypermetropia 0.018 D per year, the corneal astigmatism tends to decrease 0.0083 D per year, and the cylinder of corneal astigmatism was found to change gradually from with-the-rule to against-the-rule.Conclusion: All measurements in this study suggesting significant changes in the optical system of the eye were essentially related to age.
Atif Babiker Mohamed Ali, Khalil A. Lakho, Ahmed Elsiddig AbdElbagi. (2014) Physical and Physiological Changes with Presbyopia, Pakistan Journal of Ophthalmology, Volume 30, Issue 2.
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