Eyeworld

EW CATARACT 43 November 2017 achromatic proprietary technology are optimized to counteract the chromatic aberration of the cornea, meaning that the lens reduces this and bends red light more than blue light. Taking together the cornea plus a lens with achromatic tech- nology gives a net result of reduced chromatic aberration," he said. Dr. Holladay compared this effect to the well-known duochrome test, in which a letter chart divided into green and red colored halves indicates whether an individual is hyperopic or myopic, based on which side of the chart can be seen better. If a person sees the green half, he is hyperopic, and if he sees the red half, he is myopic. "For chromatic aberrations between 450 and 700 mm, comparing the Sym- fony with a monofocal IOL and the AcrySof ReSTOR +2.5 D IOL [Alcon, Forth Worth, Texas], the Symfony will reduce this effect, so that the normal 1.25 D cuts down to 0.84 D, about a half diopter less. The other two lenses will not show that effect. What we also need to understand is that the weight of blue and red light is not equal to yellow. If yellow light is 100% on a photopic sensitiv- ity curve, the blue and red are less than 10% of their weight, so if blue and red were weighted evenly with yellow, a circle of light would appear surrounded by rainbows. You have to weigh it by the amount of the value of red and blue light, and it is much less than 0.5 D of the benefit," he said. Clinically, the Symfony EDOF offers high contrast sensitivity, much like an aspheric monofocal lens. Binocularly, compared to the monofocal, it provides a 1.2-line improvement in intermediate UCVA and a 1.5-line improvement in near vision UCVA. Although halos and glare are still an issue, they occur less frequently than with multifocal lenses, with about 28% of EDOF pa- tients reporting halos and/or glare. EDOFs had 68% that were indepen- dent of spectacles versus 32% with monofocal IOLs. EW References 1. MacRae S, et al. Special Report: Ameri- can Academy of Ophthalmology Task Force Consensus Statement for Extended Depth Contact information Holladay: holladay@docholladay.com com/wp-content/themes/glacial/images/pciol- brochure.pdf. 2016. Accessed July 17, 2017. Editors' note: Dr. Holladay has no financial interests related to his comments. of Focus Intraocular Lenses. Ophthalmology. 2017;124:139–141. 2. Tecnis Presbyopia-Correcting IOLs bro- chure. Abbott Medical Optics. goldberg4lasik. 973-989-1600 • 800-225-1195 • www.katena.com ® K3-2542 SMILE Spatula K5-5062 Mendez SMILE Forceps SMILE I n s t r u m e n t s M e n de z S M I L E P r o ce d u r e This double-ended instrument was designed specifically for SMILE procedures. One end features a 3mm long spatula, set at a 45˚ angle, with a blunt conical tip. It is used to identify the wound site and to begin the dissection of the laser created intrastromal tunnel. The opposite end features a beveled disc-shaped distal tip with a flat posterior surface. This end is used to complete the dissection of the tunnel as well as both the anterior and posterior surfaces of the lenticule. Small Incision Lenticule Extraction is quickly gaining popularity with surgeons around the world. The procedure provides unprecedented accuracy in vision correction without the creation of a flap, thereby reducing flap-related and dry eye complications. Once the lenticule has been completely dissected, the tips of this forceps are used to reach, grasp and remove the tissue. According to Dr. Mendez, "Its atraumatic profile, round front and sides allows for easy access even in 2mm incisions. The large grasping surfaces firmly hold the lenticule without the risk of tearing it. The forceps open side-to-side as to prevent stretching and stress to the cap". Designed by Antonio Mendez, M.D. of Tijuana, Mexico KI-Adv-042817-Rev. 0

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