Work

Assessing scleral toricity induced lens flexure and contact disparity using anterior segment optical coherence tomography

Year: 2025

Type: article

Abstract: PURPOSE: To determine the influence of scleral toricity on the extent of lens contact and in-vivo flexure using anterior segment optical coherence tomography (AS-OCT), and to identify variables related to lens decentration. METHODS: Scleral toricity at a chord of 15 mm was measured using Pentacam corneoscleral profilometry (CSP) from 10 healthy young participants (22 ± 2 years) with normal corneas. Participants were fitted with the same 16.0 mm rotationally symmetric scleral lens design (hexafocon A material). AS-OCT was used in conjunction with ImageJ analysis to document the disparity of lens contact at the 15 mm chord primary toric meridians and to assess lens flexure. Additionally, central fluid reservoir (FR) depth and lens decentration were measured. RESULTS: = 0.71, p = 0.03 respectively). No significant correlation was found between lens decentration and scleral toricity (p > 0.05). CONCLUSION: Scleral toricity was significantly associated with AS-OCT measured lens flexure and contact disparity at primary toric landing locations defined by profilometry. Reducing central FR depth appears to be a good strategy for improved lens centration. Whilst equalising lens contact along toric meridians is beneficial for addressing lens flexure, the influence of this on centration is less clear.

Source: Contact Lens and Anterior Eye

DOI: 10.1016/j.clae.2025.102386

Author: Eihab Eltantawy

Institution: UNSW Sydney

Language: English

Topic: Ocular Surface and Contact Lens

Subfield: Public Health, Environmental and Occupational Health

Field: Medicine

Domain: Health Sciences

SDG: Good health and well-being

Open Access status: hybrid

Estimated APC paid: $3,740