Surgery Service | Nobel Group Eye Clinc

Principle for Ametropic Correction of iLASIK Surgery Procedures of Surgery Introduction to Characteristic of Various Equipments Selection of Surgery (Indication and Price) Dos and Don'ts before and after Surgery

Chen Hsiao-Ting Chang Chao-Kai Wang Lun-Yi Dai Wen-Ying Chao chen cheng

Index|Surgery Service

Introduction to Characteristic of Various Equipments

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1. The examination on eyeball will utilize the wavefront high-level aberration analyzer (Wave Scan) to select out the difference of optical paths based on the data of lightwave bounce, measure the cornea, lens, vitreous body, retina, etc. of eyes to determine the light spot diffusion of eyeball, then measure and thoroughly analyze the factors that would affect the diopters of eyes, draw a 3D stereoscopic graphics of eyeball, and precisely measure each part of cornea at last.

2. It can precisely analyze 85% low-level aberration (near sight, far sight and astigmatism) and 15% high-level aberration, including comet aberration, spherical aberration, trefoil aberration, and other aberrations till 20-level aberration.

INTRALASE only takes 10s to make a corneal flap in cornea by use of laser beam of near infrared light (1,053mm). And the laser beams are accurately focused on corneal endothelium, each beam will form a bubble. These bubbles would form a line from points, and then become a flat surface constituted of thousands of small bubbles, thereupon, a smooth corneal flap is formed.

Advantages:
1. It can create optimum cut for corneal implantation, obtain an even corneal flap with same thickness, and smooth stromal form with evenly symmetric water content.
2. Make a sectional structure that can perfectly match cornea, which can make corneal flap back to original position for movement prevention, promote the restoration of surface nerves and also shorten the time of dry eyes after surgery. (Figure 1)
3.Laser beams can precisely focus to fixed depth in cornea to make a flap with small error in thickness, moreover, the precision of its laser pulse can reach±5μm.

4. That can remain more stromal tissues of cornea for wider treatment.
5. That can reduce the risks for incomplete flap in course of operation.
6. That can reduce the chances of cut injection and epithelium growing from within.
7. That there is no thermal effects or shocks to affect the surrounding tissues.

In order to avoid deviation of eyeball caused by vibration, 3DActive eye Tracking follows the eyeball center to track the slight vibration in instant time for precise and perfect match combined with Iris Registration and Intelligent Optical Zones Flying-spot Scanner.

What is Iris Registration (short for IR)?
Iris location technology is to analyze the iris image of wavefront eyeball and utilize the features of iris, more individualized than that of fingerprint, to make position marks. For Visx S4 IR, it will mark many position points to your iris features and apply positioning technologies to calculate the rotation angle of your eyeballs, so as to automatically correct the cutting angle for laser surgery. As being a fully automatic instrument with eyeball positioning system, VISX S4 IR has been approved by American FDA.