Christine Purslow1, James Wolffsohn. 1. Cardiff School of Optometry and Vision Sciences, Cardiff University, Cardiff, Wales, United Kingdom. PurslowC@cardiff.ac.uk
Abstract
PURPOSE: To examine the relation between ocular surface temperature (OST) assessed by dynamic thermal imaging and physical parameters of the anterior eye in normal subjects. METHODS: Dynamic ocular thermography (ThermoTracer 7102MX) was used to record body temperature and continuous ocular surface temperature for 8 s after a blink in the right eyes of 25 subjects. Corneal thickness, corneal curvature, and anterior chamber depth (ACD) were assessed using Orbscan II; noninvasive tear break-up time (NIBUT) was assessed using the tearscope; slit lamp photography was used to record tear meniscus height (TMH) and objective bulbar redness. RESULTS: Initial OST after a blink was significantly correlated only with body temperature (r=0.80, p<0.0005), NIBUT (r=-0.68, p<0.005) and corneal curvature (r=-0.40, p=0.05). A regression model containing all the variables accounted for 70% (p=0.002) of the variance in OST, of which NIBUT (29%, p=0.004), and body temperature (18%, p=0.005) contributed significantly. CONCLUSIONS: The results support previous theoretical models that OST radiation is principally related to the tear film; and demonstrate that it is less related to other characteristics such as corneal thickness, corneal curvature, and anterior chamber depth.
PURPOSE: To examine the relation between ocular surface temperature (OST) assessed by dynamic thermal imaging and physical parameters of the anterior eye in normal subjects. METHODS: Dynamic ocular thermography (ThermoTracer 7102MX) was used to record body temperature and continuous ocular surface temperature for 8 s after a blink in the right eyes of 25 subjects. Corneal thickness, corneal curvature, and anterior chamber depth (ACD) were assessed using Orbscan II; noninvasive tear break-up time (NIBUT) was assessed using the tearscope; slit lamp photography was used to record tear meniscus height (TMH) and objective bulbar redness. RESULTS: Initial OST after a blink was significantly correlated only with body temperature (r=0.80, p<0.0005), NIBUT (r=-0.68, p<0.005) and corneal curvature (r=-0.40, p=0.05). A regression model containing all the variables accounted for 70% (p=0.002) of the variance in OST, of which NIBUT (29%, p=0.004), and body temperature (18%, p=0.005) contributed significantly. CONCLUSIONS: The results support previous theoretical models that OST radiation is principally related to the tear film; and demonstrate that it is less related to other characteristics such as corneal thickness, corneal curvature, and anterior chamber depth.
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