EyeWorld China September 2019 Issue

References 1. Expert Consensus on Topo-guided customized Laser Corneal Refractive Surgery in China (2018). Optometry Group of Ophthalmology Branch of Chinese Medical Association. Chinese Journal of Ophthalmology. 2018;54(1):23-26. 2. Ambrósio R et al. Integration of Scheimpflug-Based Corneal Tomography and Biomechanical Assessments for Enhancing Ectasia Detection. J Refract Surg. 2017 Jul 1;33(7):434-443. 3. Wallerstein A, Gauvin M, Qi SR, Bashour M, Cohen M. Primary Topography-Guided LASIK: Treating Manifest Refractive Astigmatism Versus Topography-Measured Anterior Corneal Astigmatism. J Refract Surg. 2019 Jan 1;35(1):15-23. 4. Liu, YC., Rosman, M., Mehta, JS. Enhancement after Small-Incision Lenticule Extraction. Ophthalmology 2017;124:813-821 5. Fattah MA, Antonios R, Arba Mosquera S, Abiad B, Awwad ST. Epithelial Erosions and Refractive Results After Single- Step Transepithelial Photorefractive Keratectomy and Alcohol-Assisted Photorefractive Keratectomy in Myopic Eyes: A Comparative Evaluation Over 12 Months. Cornea 2018 Jan;37(1):45-52. 6. De Ortueta D, Arba-Mosquera S, Magnago T. High-speed recording of thermal load during laser trans-epithelial corneal refractive surgery using a 750Hz ablation system. J Optom. 2019 Apr - Jun;12(2):84-91. 7. Vargas-Fragoso V and Alió J. Corneal compensation of presbyopia: PresbyLASIK: an updated review. Eye and Vision 2017;4:11. 8. GE Mei. Changes in Q factor value of corneal anterior and posterior surface after Q-factor guided LASIK. J Chinese PLA Postgrad Med Sch. 2012; 33: 831-833. Disclaimer: The opinions expressed in this symposiumhighlights are those of the speakers and not necessarily those of Alcon. Any liability or obligation for loss or damage howsoever arising is hereby disclaimed. No part of this publicationmay be reproduced by any process in any languagewithout thewritten permission of Alcon. Satisfactory results for presbyopia could be achieved by Q-adjusted customized strategy, safety, efficacy and stability of which, has been demonstrated in Custom Q LASIK. Custom Q LASIK can reconstruct the corneal aspheric surface and improve the visual acuity of presbyopic patients. The Q factor value, that determines the prolateness of the cornea is lower after Custom Q LASIK compared to the conventional LASIK. 8 “Custom Q LASIK has been shown to provide safe, effective and stable corrections in hyperopia/ emmetropia subjects with presbyopia,” added Prof Zhang. Table 7: Pre-requisites for Custom Q LASIK • Regular corneal curvature -0.4<Q<0 Cylinder <1.5D, sphere -6.0DD, <+5.0D • Pupil size and sensitivity • Simulate monovision with glass or contact lens in near/intermediate and distance • Reproducible corneal topography • Essential to make sure which eye is the dominant eye, and which one is non-dominant • Q value for non-dominate eye to be chosen according to pre-operative value. • Counsel patients to low expectation before the surgery • Minimizes potential intraoperative complications • Provides faster visual and refractive recovery