Ortho-Keratology contact lenses restore near vision in just seven days

Two researchers from the University of South Wales in Sydney have claimed that hyperopic orthokeratology (OK) contact lenses can improve near visual acuity in emmetropic presbyopic patients (people who need glasses only for reading in later life) in just seven days.

Sixteen adult patients were fitted in one eye with hyperopic orthokeratology (OK) lenses targeted to correct +2.00D. The patients wore the lenses overnight for seven days. Changes in subjective refraction and corneal topography were measured in the morning of lens removal and eight hours after lens removal.
 
Reporting their findings in the journal Optometry and Vision Science, Paul Gifford and Helen Swarbrick said that, after just one day, hyperopic OK caused a -1.00D shift in best vision sphere refraction. At day seven the change from baseline was -0.97D.
 
This led to an improvement in monocular near visual acuity from Jaeger 10.8 at baseline to Jaeger 3.9 at day seven.
 
They note that binocular distance visual acuity did not change from baseline. “Lack of change in binocular distance VA indicates that hyperopic OK offers a viable option for proving monovision correction in emmetropic presbyopia.”
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