EyeWorld China September 2019 Issue

Contoura TM Vision in Ai-er Hospitals Prof. Wang Zheng Reliable topography data, proper surgical design and registration are key aspects of successful Contoura TM treatment. Physician, technician and patient education are equally important to ensure optimal outcome. Contoura TM can be used in LASIK as well as surface ablation procedures. Fine- tuning in surgical design, especially the management of cylinder, can further improve the outcomes with Contoura TM . Dr. Rohit Shetty Narayana Nethralaya Postgraduate Institute of Ophthalmology, Bangalore, India Dr. Aanchal Gupta Cataract, Corneal and Refractive Surgeon Adelaide, Australia Dr. Rick Wolfe Director/Founder, Peninsula Eye Centre and VISTAeyes, Australia Prof. Wang Zheng Ai-Er Eye Hospital, Guangzhou, China 5 Figure 2: One-year UCVA and CDVA after Contoura TM Vision PRK plus cross-linking, based on observation by Dr Wang in Ai-er hospitals. Modified manifest refraction based Contoura TM Vision was observed to offer better predictability, accuracy and safety over SCHWIND Amaris 750S, based on experience from Dr Lin’s clinics. Even though these results were not published, these observations were consistent with the findings of a recently published study which state that topography-guided myopic astigmatism LASIK treated on the topography-measured anterior corneal astigmatism axis resulted in inferior refractive and visual outcomes compared to treating on the clinical manifest refractive astigmatism axis. 3 Dr. Wang Zheng, a Hospital Director at the Ai-er Eye Hospital, shared his experience on improving efficiency and optimising results with Contoura TM Vision. Physician education plays an important role in promoting Contoura TM Vision. Ai-er hospitals organize training courses for physicians on Contoura TM, which is particularly useful in patients with irregular corneas compared to standard treatment. “We encourage physicians to look at patient pre-operative maps to emphasize that irregular corneas are very common among patients”, stated Dr. Wang Dr Wang shared his personal experience based on the clinical procedures in his clinics. In using the Contoura TM Vision photorefractive keratectomy (PRK) plus cross-linking in 76 eyes under -6.0D with asymmetrical, irregular or very thin cornea, Dr Wang was able to observe an improvement to the UCVA and CDVA at 1-year post-operation (Figure 2). Dr Wang observed that 89% of his patients had UCVA of 20/20 and 46% had UCVA of 20/16. It was further observed that 56% patients gained one line at 1-year. There was a slight increase in spherical aberrations and the corneal coma was reduced, while the ocular coma was increased after surgery. This was because ocular wavefront centres on the pupil, while the corneal wavefront centres on the vertex, explained Dr. Wang.