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Year : 2020  |  Volume : 15  |  Issue : 2  |  Page : 227-231

A study of corneal topography in myopic patients attending eye outpatient department between 10 and 50 years to examine corneal asphericity and spherical equivalent refraction

Department of Ophthalmology, Jawaharlal Nehru Medical College, Datta Meghe Institute of Medical Sciences (Deemed to be University), Sawangi (Meghe), Wardha, Maharashtra, India

Correspondence Address:
Dr. Pravin K Tidake
Tidake Eye Clinic, St Colony, Rukmani Nagar, Wardha, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jdmimsu.jdmimsu_115_20

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Context: Evaluation of corneal curvature by corneal topography in myopic patients. Aims: To evaluate corneal topographical changes in corneal curvature in patients having myopia. Settings and Design: This is a prospective observational study conducted in a period of 6 months. A hundred eyes of fifty patients coming to the eye outpatient department (OPD) with complaint of diminution of distant vision having myopia were examined after they gave their informed consent and taking into consideration the inclusion and exclusion criteria. Subjects and Methods: A hundred eyes of fifty patients coming to the eye OPD with complaint of diminution of distant vision having myopia were examined. Patients were divided into low myopes, moderate myopes and high myopes, and corneal topography was performed in those patients and refractive error was observed. Corneal asphericity, astigmatism, and ratio of axial length (AL) and corneal radius of curvature (CRC) were observed. A correlation between refractive error and astigmatism, correlation between corneal asphericity and astigmatism, and correlation between corneal asphericity and ratio of AL with CRC were studied. Statistical Analysis Used: Statistical analysis was done using descriptive and inferential statistics using Chi-square test, one-way analysis of variance, and Pearson's correlation coefficient, and software used in the analysis were SPSS 24.0 version and GraphPad Prism 7.0 version. P < 0.05 is considered as level of significance. Results: A negative significant correlation was seen between corneal asphericity and astigmatism, corneal asphericity, and ratio of AL and CRC. A significant correlation was observed between refractive error of patients and astigmatism associated with it. Conclusions: Patients having high refractive error (high myopes) found to have higher astigmatism and corneal asphericity in high myopes. With increasing myopia, the tendency of the cornea to flatten less rapidly in the periphery was observed. In high myopes, corneal asphericity was observed to be more positive than low myopes.

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