Toric Intraocular Lenses
Toric intraocular lenses are used to correct moderate to large amounts of astigmatism at the time of cataract or lens replacement surgery.
Toric lenses have more power in one specific region in the lens to correct astigmatism as well as distance vision. Due to the difference in lens power in different areas, the correction of astigmatism with a toric lens requires that the lens be positioned in a very specific configuration. While toric lenses can improve distance vision and astigmatism, the patient still will require corrective lenses for all near tasks, such as reading or writing.
Toric lenses are classified as "High Performance Lenses" and are either Monofocal Toric or Multifocal / Trifocal Toric. Very accurate measurements of the corneal curvature and length of the eye are required along with topographic maps and aberrometry to ensure accurate lens calculation and orientation at the time of surgery. Trifocal Toric lenses in particular may have to be bespoke manufactured and this may affect when surgery can be performed.
Centre for Sight Development helps Toric Lens Surgery
In collaboration with Nidek, Medical Director Sheraz Daya has developed a report generated by the Nidek OPD machine. The machine images the eye and measures the refraction, corneal shape and eye aberrometry separating out internal aberrations from corneal aberrations. Sifting through what the machine is able to measure, a report has been generated to help surgeons determine what magnitude of astigmatic correction is required and in what orientation the implant has to be applied at the time of surgery. The "Daya Cataract/ RLE Report" will be released in September 2014.