Shih Kae Chew, student of the Master in Clinical Optometry and Vision Therapy has been published on JOJ Ophthalmology. His Master´s Thesis “Toric Orthokeratology Effectiveness on Correcting Astigmatism: A Narrative Literature Review” assesses toric orthokeratology studies performed by different researchers between 2007 and 2017.
The author has been fitting spherical Ortho-K to patients and in his thesis explore toric options for moderate to high corneal astigmatism. Astigmatism commonly appears together with ametropia. Spherical Ortho-K has diopter limit (D) for astigmatism correction.
Results show that toric periphery/ alignment zone Ortho-K can improve lens centration for astigmatic correction and the combination of toric reverse zone and toric alignment zone (full toric/dual toric/real toric) is more effective for medium to high astigmatism.