If you have been following this topic, you would have seen our earlier posts here and here
We are pleased to report that Dr Ahmed Abass has published his paper which we are proud to have co-sponsored with Fight for Sight.
Dr Abass has kindly provided the following simplified abstract. The full paper can be read here. You can also view his other papers on his University Page here
Purpose
The study aimed to investigate whether non-orthogonal correction in spectacles would improve the visual acuity of people with keratoconus. Non-orthogonal correction is where the angle between the cylinder powers of a spectacle lens for astigmatism is less than or greater than 90 degrees. Typically, keratoconus patients have this type of astigmatism, which is why standard glasses do not work well.
Methods
The study involved 18 patients with keratoconus from an eye clinic in Liverpool. After evaluating their eye condition, 23 eyes were selected for testing, while others were excluded due to the eye having little or no keratoconus or severe dryness. Each eye was tested first with standard lenses, and then with non-orthogonal lenses. The lenses were tested with different angles until the best one was found for each person. Participants were asked to rate their vision, specifically how clear letters appeared and how much “ghosting” (double vision) they experienced with each lens type.
Results
Of the eyes tested, 61% showed improved vision with non-orthogonal lenses, 30% saw no change, and 9% saw a slight decrease in vision. Regardless of vision improvement, 87% of participants noticed clearer letters, and 79% reported less ghosting. Most of the preferred angles for the non-orthogonal lenses were between 80° and 85°. The study also showed that for many people, the non-orthogonal lenses could provide a more accurate prescription compared to regular lenses. Nearly all participants said they would be interested in trying non-orthogonal glasses.
Conclusions
The study suggests that non-orthogonal lenses could improve vision and reduce issues like ghosting for people with keratoconus. While this is a promising step toward developing better glasses for these patients, more work is needed before these lenses can be made for everyday use.
We are hoping to arrange for Dr Abass to speak at one of our future events.
