Research Artilce
Volume 11 Issue 8 - 2020
Relationship between Pupil Size in Different Degrees of Myopia in Young Adults in a University Community
Nnenne U Onu1*, Isaac N Akpala1, Okechi U Amaechi1, Ndukuba S O1, Christopher O Timothy1, Udo A Ubani1, Uchechi C Chijioke1, Andrew U Omaka1, Amarachi C Ezeigbo1, Jacqueline E Obioma-Elemba2, Ikesinachi S Uwaezuoke3
1Department of Optometry, Abia State University, Uturu, Nigeria
2Department of Optometry, Imo State University, Owerri, Nigeria
3Department of Optometry, Hospital Management Board, Abia State
*Corresponding Author:Nnenne U Onu, Department of Optometry, Abia State University Uturu, Nigeria.
Received: April 28, 2020; Published: August 14, 2020


Purpose: To evaluate the relationship between pupil size in different degrees of myopia.

Method: This was investigated in 100 randomly selected young myopes of both sexes, aged 18 - 25 years and selected from Abia State University community. The subjects were examined in the university clinic using standard optometric procedures. The degrees of myopia were in the ranges of -0.25 to -1.00DS, -1.25 to -3.00DS, -3.25 to -6.00DS, -6.25 to -10.00DS and > -10.00DS. The pupil diameter was measured monocularly using the Pupillary Distant Rule in the clinic under room illumination and values were recorded to the nearest 0.5 mm.

Results: The mean pupil size for the myopes in this study was 4.33 ± 1.12 mm and mean pupil size for each degree of myopia was 3.03 mm, 3.79 mm, 4.60 mm, 5.71 mm and 7.00 mm respectively. Using the X2 statistical analysis at 0.05 level of significance (α), critical or cut off value 12.59158724, df 6 and X2 = 104.51. X2 was greater than the cut off or critical value, therefore a relationship exists between the degree of myopia and pupil sizes. They are dependent. It was found that there was significant increase in pupil size with increase in degree of myopia. The contingency value (C) of 0.71486 indicates a strong association exists between degree of Myopia and pupil sizes (P-value). The mean pupil size of the females was also significantly greater than that of the males. P-value is 2.8629 x 10-20. P-value is less than significance level (0.05). Therefore, the result is statistically significant - A significant relationship exists between the two attributes, pupil sizes and degree of myopia. The contingency value (C) of 0.71486 indicates a strong association exists between degree of Myopia and pupil sizes.

Conclusion: The pupil size increased with increase in degree of myopia, therefore the size of the pupil could give one an idea of the degree of myopia and the presence of a relationship between pupil size and degree of myopia. Female myopes had greater mean pupil size than the males showing that variation in pupil size with degree of myopia is gender related.

Keywords: Gender; Myopia; Pupil Size; Young Adults; Relationship


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Citation: Onu N U., et al. “Relationship between Pupil Size in Different Degrees of Myopia in Young Adults in a University Community”. EC Ophthalmology 11.9 (2020): 01-08.

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