Purchase this article with an account.
C. Purslow, V. O'Connor, M. P. Rubinstein; Thermal Imaging of the Ocular Surface and Adnexa. Invest. Ophthalmol. Vis. Sci. 2008;49(13):2264. doi: https://doi.org/.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
To assess typical ocular thermal symmetry in a group of control subjects, and to observe whether inter-ocular asymmetry in selected subjects appears related to the presence of pathology of the ocular surface or adnexa.
A portable infra-red camera (ThermoVision A40M, Flir) was used to record asymmetry in ocular and peri-orbital skin surface temperature in 49 healthy control subjects (19M, 30F; mean age 41.3±18.2yrs), and in 22 symptomatic patients (14M, 8F; mean age 44.1±19.7yrs) attending a hospital emergency department. Statistical comparisons using paired t-tests and confidence intervals were applied between controls and groups of pathology, and cases of isolated pathology were also observed.
In control subjects, the mean temperature difference between corneae was 0.06±0.23°C (95% CI -0.005 to 0.13°C; p=0.07), and typical peri-orbital asymmetry was 0.09±0.19°C (95% CI 0.04 to 0.15°C; p<0.05). There was no significant thermal asymmetry between symmetrical points on the face (0.05±0.42°C (95% CI -0.07 to 0.17°C; p=0.41). The effect of age (0.07<p<0.52) and gender (0.29<p<0.94) on thermal asymmetry in control subjects was statistically insignificant. Subjects with chalazia (n=10) showed significant thermal asymmetry between eyelids: mean difference +0.54±0.33°C (95% CI 0.19 to 0.88°C; p<0.05). Ocular surface temperature overlying corneal abrasions (n=6) increased by +0.70±0.31°C (95% CI 0.37 to 1.02°C; p<0.005), whereas in cases of acute corneal ulceration (n=3) average thermal difference between corneae was -2.39±0.83°C (95% CI -4.45 to -0.32°C; p<0.05), with the affected eye exhibiting the reduced temperature. Where an inflammation of the iris, sclera or conjunctiva was present, the overlying increase in temperature varied from +1.52 to +3.66°C, compared with the fellow eye in individuals (n=3).
This PDF is available to Subscribers Only