Highlights
- •Anterior scleral asymmetry was found to be significantly different between myopes and emmetropes.
- •Axial length and refractive power are highly correlated with the anterior scleral shape.
- •The more myopic the eye, the less asymmetric the anterior sclera.
Abstract
Purpose
To in-vivo quantify differences in anterior scleral shape between myopes and emmetropes
and relate them with axial length and refractive power.
Methods
Forty-two participants (84 eyes) were included in this study. Twenty-five participants
were categorised as emmetropes and seventeen participants were categorised as myopes.
The refractive state was measured monocularly using a closed window autorefractometer.
Axial length was acquired using an optical biometer and topographical data was obtained
using a non-contact corneo-scleral topographer. Anterior scleral asymmetry was calculated
from 3-dimensional data using a custom-made algorithm and further correlated to axial
length and refractive power. Right and left eyes were analysed independently.
Results
The anterior scleral shape was highly correlated with axial length (OS and OD: R = 0.76,
p < 0.001) and moderately correlated with refractive power (OS: R = 0.48, OD: R = 0.53,
both p < 0.01). The more myopic the eye, the less asymmetric the anterior sclera.
Conclusions
Both axial length and refractive power are well correlated with the anterior scleral
shape. The refractive state of each patient should therefore be taken into consideration
when analysing scleral shape when planning certain treatments or surgeries and when
fitting scleral contact lenses.
Keywords
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Article info
Publication history
Published online: November 01, 2018
Accepted:
October 26,
2018
Received in revised form:
October 26,
2018
Received:
September 18,
2018
Identification
Copyright
© 2018 British Contact Lens Association. Published by Elsevier Ltd. All rights reserved.
