Geometrical characterization of the corneo-scleral transition in normal patients with Fourier domain optical coherence tomography

Seguí-Crespo, M; Ariza Gracia, Miguel Angel; Sixpene, NLD; Piñero, DP (2019). Geometrical characterization of the corneo-scleral transition in normal patients with Fourier domain optical coherence tomography. International ophthalmology, 11(39), pp. 2603-2609. Springer 10.1007/s10792-019-01109-5

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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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