Abstract
Purpose
To report a case of reduced aniseikonia in a myopic axial anisometrope during orthokeratology
(OK) lens wear.
Case report
A 19-year-old female university student with myopic anisometropia presented for an
OK lens fitting consultation. At baseline, perceptual interocular image size difference
or aniseikonia of 1.45% was found, with a smaller image seen by the right eye compared
to the left eye. The patient was fitted with a pair of OK lenses and interocular image
size differences, subjective refraction and corneal topography were measured after
7, 14 and 47 days of overnight lens wear. Hyperopic shifts in central refraction and
corresponding flattening of the central cornea was measured during OK treatment. Aniseikonia
reduced after OK wear with the most significant change measured from baseline to day
7. Aniseikonia recorded after 7, 14 and 47 nights of lens wear was 0.05%, 0.35% and
0.85%, respectively. Although minimum differences in refractive error between eyes
was reached after 47 days of OK, aniseikonia was greater than that measured after
7 and 14 days of OK.
Conclusion
This case report demonstrates reduction in aniseikonia with OK lens wear in a myopic
patient with axial anisometropia, although this effect was not sustained beyond 1
week of lens wear. As the impact of corneal curvature changes on aniseikonia is not
well understood, future studies on the impact of OK on aniseikonia and associated
asthenopia is required.
Keywords
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Article info
Publication history
Published online: November 12, 2019
Accepted:
October 20,
2019
Received in revised form:
September 4,
2019
Received:
January 16,
2019
Identification
Copyright
© 2019 British Contact Lens Association. Published by Elsevier Ltd. All rights reserved.
