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Year : 2006  |  Volume : 54  |  Issue : 2  |  Page : 95-98

ProTon tonometer determination of intraocular pressure in patients with scarred corneas

Department of Ophthalmology, Post Graduate Institute of Medical Research and Education, Chandigarh, India

Correspondence Address:
Arun K Jain
Advanced Eye Centre, Post Graduate Institute of Medical Research and Education, Chandigarh - 160 012
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0301-4738.25829

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Purpose: To evaluate the measure of intraocular pressure (IOP) in patients with scarred corneas obtained from the affected and non-affected areas. Materials and Methods: Eighteen patients with small maculo-leucomatous corneal opacity following microbial keratitis were prospectively included in the study. Goldmann applanation tonometry was done first on the non-affected corneal surface. ProTon tonometry (PT) was then carried out on the same eye, to obtain IOP measurements from the non-affected (PT1) and the affected area (PT2) of the cornea. The IOP measurements were compared using a two-tail paired t test. Results: The mean of IOP measurements of PT 2 and PT1 was 22 mm of Hg (SD 5.2) and 14.8 mm of Hg (SD 5.4), respectively. The higher reading of PT2 was statistically significant ( P <0.001). The mean Goldmann applanation tonometry was 14.6 mm of Hg (SD 5.4) and it did not differ significantly ( P = 0.86) from the PT1 readings of 14.8 mm of Hg (SD 5.4). Conclusion: In patients with maculo-leucomatous corneal opacity, determination of IOP by ProTon tonometer varies from the affected to the non-affected area. The ProTon tonometer overestimates the level of IOP when it is applied to a leucomatous corneal opacity.

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