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First Author: J.Cabrerizo SPAIN
Co Author(s): J. Garrido Fierro J. Urcola Carrera G. Garay Aramburu
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To determine anterior scleral thickness using Swept Source OCT to determine its repeatability and reliability and to evaluate its correlation with corneal tomography data in healthy and keratoconus patients.
Department of Ophthalmology. University Hospital of Alava. Vitoria-Gasteiz. Spain.
A total of 44 patients suffering from bilateral keratoconus and 20 control subjects were included in our study. Subjects with previous anterior segment surgery, current acquired corneal surface disorders or infections or any ocular disease affecting anterior segment structure were dismissed. Four angle HD images (superior, inferior, temporal and nasal) were taken in every eye using Casia-1000, Tomey, Nagoya, Japan. Anterior scleral thickness was measured using the caliper software of the device at 1 and 2 mm distance from the scleral spur. Corneal tomography (Sirius, CSO, Italy) was performed in every eye. Patients were asked to stop contact lens wearing for at least 1 week prior to every examination.
Anterior and posterior scleral borders could be recognized in every image. Statistically significative differences in anterior scleral thickness among sectors within both groups were found. A strong interpersonal variability of anterior scleral thickness was found. Correlation between anterior scleral thickness peripheral corneal thickness was found showing statistically significative differences.
Swept Source OCT enables non invasive measurement of the anterior scleral thickness in keratoconus and healthy patients. Correlation between anterior scleral thickness and corneal tomographic values was found. Anterior corneal thickness may give useful information when included within the follow up of keratoconus patients.