Mar Seguí-Crespo1,2, Miguel Ángel Ariza-Gracia3, Nelva de Luisa David Sixpene1, David P Piñero4,5. 1. Department of Optics, Pharmacology and Anatomy, University of Alicante, Crta San Vicente delRaspeig s/n 03016, San Vicente del Raspeig, Alicante, Spain. 2. Public Health Research Group, University of Alicante, Alicante, Spain. 3. Institute of Engineering of Aragón (I3A), University of Zaragoza, Zaragoza, Spain. 4. Department of Optics, Pharmacology and Anatomy, University of Alicante, Crta San Vicente delRaspeig s/n 03016, San Vicente del Raspeig, Alicante, Spain. david.pinyero@ua.es. 5. Department of Ophthalmology, Vithas Medimar International Hospital, Alicante, Spain. david.pinyero@ua.es.
Abstract
PURPOSE: To characterize the geometry at the corneo-scleral transition for a normal population and its correlation with other anatomic parameters of the eyeball. METHODS: Transversal epidemiologic study on a sample of 100 individuals (right eye) in different ethnic groups (Africans and Caucasians). All of them were examined with Fourier domain optical coherence tomography, auto-refractometer, topographer, and biometer to obtain the corneo-scleral angle (CSA) and additional clinical parameters. The dataset was analyzed to determine correlations between different anatomical parameters and nasal (CSAn) and temporal CSA (CSAt) values. RESULTS: The CSAt presents a significant but low correlation with the anterior chamber depth-ACD (r = 0.25; p = 0.024), the white-to-white (W-W) distance (r = 0.27; p = 0.022), and the anterior chamber volume (r = 0.25; p = 0.016). CSAn did not correlate significantly with any clinical variable, with all values being lower than 179° (concave). Ethic groups presented significant differences for pachymetry (Pac) and corneal volume (p = 0.033 and p = 0.014), being greater for Caucasians, and temporal corneo-iridial angle (p = 0.006), being greater for Africans. CSA presented and inverse correlation with age. CONCLUSIONS: The CSAn presents a more concave profile for the normal population, whereas the CSAt presents a planar-convex profile with a great influence of age. In particular, the older the patient, the more convex the CSAt is. This age-related evolution of the CSAt and the concavity on the nasal direction must be considered when prescribing scleral contact lenses or when performing limbal incisions during refractive interventions.
PURPOSE: To characterize the geometry at the corneo-scleral transition for a normal population and its correlation with other anatomic parameters of the eyeball. METHODS: Transversal epidemiologic study on a sample of 100 individuals (right eye) in different ethnic groups (Africans and Caucasians). All of them were examined with Fourier domain optical coherence tomography, auto-refractometer, topographer, and biometer to obtain the corneo-scleral angle (CSA) and additional clinical parameters. The dataset was analyzed to determine correlations between different anatomical parameters and nasal (CSAn) and temporal CSA (CSAt) values. RESULTS: The CSAt presents a significant but low correlation with the anterior chamber depth-ACD (r = 0.25; p = 0.024), the white-to-white (W-W) distance (r = 0.27; p = 0.022), and the anterior chamber volume (r = 0.25; p = 0.016). CSAn did not correlate significantly with any clinical variable, with all values being lower than 179° (concave). Ethic groups presented significant differences for pachymetry (Pac) and corneal volume (p = 0.033 and p = 0.014), being greater for Caucasians, and temporal corneo-iridial angle (p = 0.006), being greater for Africans. CSA presented and inverse correlation with age. CONCLUSIONS: The CSAn presents a more concave profile for the normal population, whereas the CSAt presents a planar-convex profile with a great influence of age. In particular, the older the patient, the more convex the CSAt is. This age-related evolution of the CSAt and the concavity on the nasal direction must be considered when prescribing scleral contact lenses or when performing limbal incisions during refractive interventions.
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