Scleral lens landing zone toricity and tear exchange

Asif Iqbal; Damien Fisher; David Alonso-Caneiro; Michael J Collins; Stephen J Vincent

doi:10.1016/j.clae.2025.102571

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Scleral lens landing zone toricity and tear exchange

Journal article

Open access

Peer reviewed

Scleral lens landing zone toricity and tear exchange

Asif Iqbal, Damien Fisher, David Alonso-Caneiro, Michael J Collins and Stephen J Vincent

Contact Lens & Anterior Eye, Vol.49(1), pp.1-6

2026

DOI: https://doi.org/10.1016/j.clae.2025.102571

PMID: 41308327

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Abstract

Landing zone toricity

Profilometry

Scleral lens

Tear exchange

Purpose To quantify the effect of landing zone toricity on tear exchange during short-term scleral lens wear using a profilometry based method. Methods Nine healthy participants wore scleral lenses (KATT™, Capricornia) with a spherical and 150 μm toric landing zone in a randomised order on separate days, with other lens parameters held constant. Following the instillation of 10 µl of 2 % sodium fluorescein, Eye Surface Profiler images were captured over 100 min of lens wear. A second dose of 10 µl of 2 % sodium fluorescein was instilled after 90 min of lens wear. Fluorescence intensity data were extracted and analysed over central (5 mm diameter, coincident with the centre of the horizontal visible iris diameter [HVID]) and peripheral regions (1 mm annulus, with the HVID as the outer border). Results Fluorescence intensity varied throughout lens wear, with the toric lens design displaying greater fluorescence intensity than the spherical design at 0, 60, and 100 min (all p < 0.05), when averaged across both regions. The ingress of sodium fluorescein was evident with the toric lens design in both central and peripheral regions during the first 30 min of wear, followed by a gradual decline, while the spherical design stabilised after 5–10 min. The toric lens design displayed tear exchange following the reapplication of sodium fluorescein after 90 min of lens wear, while the spherical design did not. Conclusions Scleral lenses with a toric landing zone facilitated greater central and peripheral tear exchange than a spherical lens design. Alterations to the scleral landing zone which enhance tear exchange may have clinical implications for reducing peripheral corneal oedema during lens wear.

Details

Title: Scleral lens landing zone toricity and tear exchange
Authors: Asif Iqbal (Corresponding Author) - Queensland University of Technology
Damien Fisher - Queensland University of Technology
David Alonso-Caneiro - University of the Sunshine Coast, Queensland, School of Science, Technology and Engineering
Michael J Collins - Queensland University of Technology
Stephen J Vincent - Queensland University of Technology
Publication details: Contact Lens & Anterior Eye, Vol.49(1), pp.1-6
Publisher: Elsevier BV
Date published: 2026
DOI: 10.1016/j.clae.2025.102571
ISSN: 1476-5411; 1367-0484
PMID: 41308327
Copyright note: © 2025 The Author(s). Published by Elsevier Ltd on behalf of British Contact Lens Association. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Grant note: Asif Iqbal was funded by QUT Postgraduate Research Award PhD scholarship and Dorothy Carlborg Research Award from the Cornea and Contact Lens Society of Australia.
Organisation Unit: School of Science, Technology and Engineering
Language: English
Record Identifier: 991186532302621
Output Type: Journal article

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