A STUDY ON CORNEAL ASTIGMATISM IN PTERYGIUM CASES BEFORE AND AFTER SURGERY
Journal Title: Journal of Evidence Based Medicine and Healthcare - Year 2018, Vol 5, Issue 9
Abstract
BACKGROUND Pterygium is a common degenerative condition seen in the Indian subcontinent. One of the indications for pterygium excision is visual impairment due to astigmatism. Several mechanisms have been suggested to explain the induced astigmatism – a) pooling of the tear film at the leading edge of the pterygium, b) mechanical traction exerted by the pterygium on cornea. Hence this study was done retrospectively to assess the effect of pterygium excision on the induced astigmatism. MATERIALS AND METHODS Records of patients operated for primary ocular pterygium by pterygium excision with primary conjunctival closure/ conjunctival autograft in the age group 18 - 70 years over a 1-year period were analysed retrospectively. Pre-operative and post-operative follow up records of day 1 and 1 st month were analysed for changes in corneal curvature and astigmatism using the recorded Automated Refractometry and Keratometry readings. RESULTS Out of the 44 cases analysed retrospectively as 2 groups – pterygium excision with primary conjunctival closure and pterygium excision with conjunctival autograft, majority of them were found to be females (70%), and between 40 - 50 years (90%). Most of the pterygium cases were found to be nasal, and commonly in the right eye and also that the amount of astigmatism increased with the grading of pterygium (p<.000). The most common type of astigmatism noted was “with the rule” astigmatism (75%). The percentage of “against the rule” and oblique astigmatism were 9% & 15% respectively. The decrease in the mean astigmatism after surgery was found to be statistically significant. The difference in t value between the preoperative and one-month postoperative corneal astigmatism was 2.5 D (p<.018). Steepening of both horizontal and vertical meridian was found in conjunctival autograft cases, but in simple closure cases steepening was found only in the vertical meridian. CONCLUSION To conclude, pterygium leads to a considerable effect on corneal refractive status. The common type of astigmatism seen in patients with pterygium is “with-the rule”. There was a positive correlation between the grading of Pterygium and the induced astigmatism. Pterygium surgery effectively decreases this cylindrical error and reverts corneal curvatures towards normality, thus improving subjective visual acuity.
Authors and Affiliations
Kalanchiarani S, Vinodhini Kannan, Nazeem Farzana Ghouse
Keywords
Related Articles
- EP ID EP474728
- DOI 10.18410/jebmh/2018/168
- Views 72
- Downloads 0
STUDY OF SURFACE EPITHELIAL OVARIAN MALIGNANCIES WITH REFERENCE TO THEIR HISTOLOGICAL GRADING AND ER & KI-67 IMMUNOREACTIVITY
BACKGROUND We wanted to evaluate the relation of histopathological grading of malignant surface epithelial ovarian neoplasms and evaluate ER and Ki -67 as prognostic markers to provide the clinician a better platform for...
LIFE EVENTS & PSYCHIATRIC MORBIDITY IN SCHOOL CHILDREN
Psychiatric morbidity in school children can be multi-factorial. Stress in school and other life events contribute significantly to it. There are many western studies on the effects of life events on children and adolesc...
EPIDURAL STEROID REDUCES DISCOGENIC PAIN IN ACUTE FLARE UP OF DEGENERATIVE DISC DISEASE WITH MODIC CHANGES THAN CONSERVATIVE MANAGEMENT
BACKGROUND Epidural Steroid Injection for radicular pain is an Effective method of treatment. No conclusive evidence exists to compare the efficacy of Epidural steroid injections (ESI) and conservative Management in Acut...
A STUDY OF CORRELATION OF FOOT LENGTH AND GESTATIONAL MATURITY IN NEONATES
BACKGROUND Gestational age estimation at birth can be done by clinical estimation through careful history of LMP, ultrasonic estimation of gestational age, date of first recorded foetal activity “quickening” first felt a...
KNOWLEDGE OF BLOOD TRANSFUSION AMONG THE NURSING STAFF IN A TERTIARY MEDICAL COLLEGE, BANGALORE
BACKGROUND The transfusion of blood products is essential for restoring the body’s oxygen transport capacity or replenishing lost or depleted blood components. Whether to transfuse a blood or not will be decided by a phy...