RELATIONSHIP BETWEEN PUPIL SIZE AND AMPLITUDE OF ACCOMMODATION IN MYOPES AND HYPEROPES

ABSTRACT

Pupil size and Amplitude of Accommodation are two important physiological ocular parameters that affects visual functions. Pupil size plays a role in controlling how light enters the eye. However, the relationship between pupil size and amplitude of accommodation has not been fully understood, particularly in myopes and hyperopes. To determine the relationship between pupil size and amplitude of accommodation in myopes and hyperopes. A total of 30 participants, Sixty (60) eyes of patients in the age group 18–35years, who attended university of Benin optometric outpatient clinic who met the inclusion criteria were studied. The pupil size of subjects, grouped into myopes and hyperopes were determined using a pd rule, and their amplitude of accommodation with a meter rule using push up to blur technique. The Pearson's Correlation was used to determine if there is any relationship between pupil size and amplitude of accommodation among both myopic and hyperopic subjects. The Results of the study showed a significant difference in AOA between the two refractive groups and the mean AOA of myopic individuals was substantially greater than that of hyperopic ones, The mean pupil size in myopes were found to be 4.56±0.93, while the mean pupil size in hyperopes was 3.46±0.95. The mean AOA in myopic group were found to be 13.46±3.56 while the mean AOA in hyperopic group was 10.25±1.65. The results finding showed that in both the myopic and the hyperopic individuals, there was no statistically significant negative correlation (p > 0.05) between AOA and pupil size. The Pearson’s R coefficient revealed a negative correlation in myopes (-0.2231), which is not significant (p > 0.05). no correlation was seen in hyperopes (-0.294), similarly not significant (p > 0.05). This study concluded that there is no significant negative correlation between amplitude of accommodation and pupil size.  However, further studies should examine the relationship between these parameters among other groups. Key words: pupil size, amplitude of accommodation, physiological, refractive error, diopter.