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A prospective observational study to evaluate changes in symthom score and oculothermographic imaging in contact lens wearers

Poster Details

First Author: D.Sen INDIA

Co Author(s):    H. Datta   J. Dutta   A. Vinayak        

Abstract Details


1. To assess the thermal changes in patients with contact lens use in comparison to non-contact lens persons, in relation to- • Duration of use • Period of use • Environment • Nature of work 2. Relation between symptomatic change and change of thermal picture.


Regional Institute of Ophthalmology, Kolkata, India


After proper ethical committee clearance, study population selected from the contact lens clinic following certain inclusion and exclusion criteria. Age matched controls were selected from the general population who were not contact lens users. Oculothermographic imaging (infra red camera) done on each subject following standardised procedure under controlled conditions. During analysis for standardization the mean dT of central 10 pixel by 10 pixel area of ocular surface has been used. Mean of the series of mean dT for each individual was calculated and compared. MATLAB was used for generating results and Microsoft excel used for analysis of the data.


Scatter diagram revealed, the mean of mean dT of right and left eyes of CONTACT LENS USERS with contact lenses are much more diffusely situated than CL NON-USERS which was statistically significant (p=0.0002 and p=0.00011). Both eyes of CONTACT LENS USERS without their contact lenses show a more diffuse distribution than the CL NON-USER, right eyes (p=0.013) showing statistical significance but not the left eyes (p=0.31). Statistically, no significant difference were found to be present between the means of mean dT of all contact lens users with and without their contact lenses (p=0.57 and p=0.37 for right and left eyes).


Thermal imaging showed a significant difference between contact lens non users and users especially with their contact lenses in situ. The difference was less with the contact lenses taken off. There was no significant difference between individuals with their contact lenses on and off. Hence, thermal imaging was able to detect a significant change in the ocular surface temperature in prolonged contact lens users, when there was no clinical disease and the Schirmer’s test, TBUT and Fluorescein Scores were within normal limits. This could have a role in future of diagnostics in ocular surface diseases.

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