Clinical Assessment of Visual Acuity, Stereoacuity, and Binocular Vision Parameters in Keratoconus Patients After Corneal Rigid Gas Permeable Lens Wear
Tsering L. Shongmu, Aditya GoyalAbstract
Clinical Relevance:
Beyond visual acuity, keratoconus may affect binocular visual function. Comprehensive assessment of vergence, accommodation, and stereoacuity may provide a better understanding of functional vision and help guide contact lens rehabilitation in patients with keratoconus.
Background:
Keratoconus causes irregular astigmatism and reduced visual quality, potentially affecting binocular function. Although corneal RGP lenses improve vision, their effects on binocular function remain unclear. This study evaluated their effects on visual acuity, stereoacuity, and binocular vision in patients with bilateral keratoconus.
Methods:
In this prospective cohort study, 50 neophyte patients with bilateral keratoconus underwent baseline assessment of distance and near visual acuity, stereoacuity, vergence, accommodative, and binocular vision parameters using best-corrected spectacle correction. Following corneal rigid gas permeable (RGP) lens fitting, all measurements were repeated after six months of lens wear.
Results:
Corneal RGP lens wear significantly improved distance visual acuity in the worse seeing eye, better seeing eye, and binocularly (all
Conclusion:
After six months of RGP lens wear, significant improvements were observed in visual acuity and stereoacuity, with moderate-to-large changes in selected binocular vision parameters. However, some statistically significant binocular outcomes showed small or negligible effects.