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ORIGINAL ARTICLE
Year : 2013  |  Volume : 61  |  Issue : 10  |  Page : 580-584

Long-term change in central corneal thickness from a glaucoma perspective


Department of Glaucoma project, Chennai Glaucoma Study, Vision Research Foundation, Sankara Nethralaya, 18, College Road, Chennai 600006, India

Correspondence Address:
Ronnie George
Jadhavbhai Nathamal Singhvi Department of Glaucoma, Medical Research Foundation, Sankara Nethralaya, 18, College Road, Chennai - 600 006
India
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Source of Support: The Chennai Willingdon Corporate Foundation, Conflict of Interest: None


DOI: 10.4103/0301-4738.119338

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Aim: To investigate the longitudinal change in central corneal thickness (CCT) over 3 years in patients with glaucoma. Materials and Methods: The Chennai Glaucoma Follow-up Study, an offshoot of the Chennai Glaucoma Study, was designed to evaluate the progression of glaucoma. A cohort of participants in the Chennai Glaucoma Study that were suffering from glaucoma or were at a higher risk for glaucoma underwent comprehensive ophthalmic evaluation at the base hospital at 6-month intervals during the years 2004 to 2007. The CCT (average of 10 readings) was measured between 11 am and 1 pm on any given day using an ultrasonic pachymeter. Patients with a history of ocular surgery, corneal disease and usage of topical carbonic anhydrase inhibitor were excluded. No patient was a contact lens wearer. Results: One hundred and ninety-six patients (84 male, 112 female) met the inclusion criteria. We analyzed data from the right eye. The mean age of the patients was 59.97 ± 9.06 years. Fifty-nine (30.1%) of the patients were diabetic. The mean change in CCT (CCT at first patient visit - CCT at last patient visit) was 3.46 ± 7.63 μm. The mean change in CCT was 0.75 μm per year (R 2 = 0.00). Age, gender, intraocular pressure at the first patient visit and diabetic status had no significant influence on the magnitude of change in CCT. Conclusion: A carefully obtained CCT reading by a trained examiner need not be repeated for at least 3 years as long as the ocular and systemic factors known to affect the measurement of CCT are constant.


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