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| Changes and Analysis of Angle Kappa under Photopic and Mesopic Pupils in Myopia Patients |
| Yaqin Nie1, Xi Qiao1, Yaling Ma2 |
| 1Ningxia Medical University, Yinchuan 750004, China
2Department of Ophthalmology, General Hospital of Ningxia Medical University, Yinchuan 750003, China |
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Abstract Objective: To study the changes of horizontal and vertical shifts of angle Kappa in myopic patients from mesopic condition to photopic condition. Methods: In this cross-sectional study. A total of 120 patients (240 eyes) who were diagnosed with myopia at the Outpatient Myopia Center of Ningxia Medical University General Hospital from November 2020 to December 2021 were selected by simple random sampling and examined under mesopic condition and photopic condition using a Bausch & Lomb Orbscan II corneal topographer. Then records the diameter of the photopic and mesopic pupils, the angle of angle kappa under photopic and mesopic pupils, and the horizontal and vertical displacement. Paired t-test was used to compare the pupil diameter and angle Kappa of the left and right eyes under photopic and mesopic conditions; the quadrant distribution of the angle Kappa of both eyes under photopic and mesopic conditions was analyzed by scatter plot. Results: The pupil diameters of both eyes under mesopic condition were signifcantly larger than those under photopic condition, with signifcantdifferences (t=13.67,P<0.001; t=13.48, P<0.001). The angle Kappa of the left eyes were larger than that of the right eyes in both mesopic and photopic conditions, and both were signifcantly different (t=4.15, P=0.021; t=5.27, P=0.008). When shifting from mesopic condition to photopic condition, the distribution of angle Kappa in both eyes showed mirror symmetry, with horizontal displacement mainly deviating to the nasal side and vertical displacement mainly deviating to the superior side. The mean vector displacement of right eyes was 0.168±0.100 mm, 87.5% of the right eyes had a vector displacement of less than 0.3 mm. The mean vector displacementoflefteyeswas0.171±0.069mm, 92.5% of the left eyes had a vector displacement of less than 0.3 mm. The vast majority of myopic patients have a vector displacement of 0.3 mm or less. Conclusion:From mesopic to photopic condition, pupil diameters become small and the angle Kappa distribution in myopic patients mainly shift to nasal and superior direction.
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Received: 12 January 2022
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| Fund:General Project of Ningxia Natural Science Foundation (2022AAC03474) |
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Corresponding Authors:
Yaling Ma, Department of Ophthalmology, General Hospital of Ningxia Medical University, Yinchuan 750003, China (Email: myleye@163.com)
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