Refractive Lens Surgery

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Fig. 24.2. The tip undergoes compression and expansion, continuously changing its dimensional length. Heat is generated due to intermolecular friction Fig. 24.3. The tip moves back and forth without changing its dimensional length. Heat due to intermolecular friction is eliminated nology that has received extensive attention for improvement has been the attempt to maximize anterior chamber stability while concurrently yielding larger amounts of vacuum for lens removal. The Wave addresses these concerns of heat generation and chamber stability with the advent of its revolutionary “Sonic” technology and high-resistance “SuperVac” coiled tubing. Sonic technology offers an innovative means of removing cataractous material without the generation of heat or cavitational energy by means of sonic rather than ultrasonic technology.A conventional phacoemulsification tip moves at ultrasonic frequencies of between 25 and 62 kHz. The 40-kHz tip ex- Chapter 24 The Staar Sonic Wave 223 pands and contracts 40,000 times per second, generating heat due to intermolecular frictional forces at the tip that can be conducted to the surrounding tissues (Fig. 24.2). The amount of heat is directly proportional to the operating frequency. In addition, cavitational effects from the high-frequency ultrasonic waves generate even more heat. Sonic technology operates at a frequency much lower than ultrasonic frequencies. Its operating frequency is in the sonic rather than the ultrasonic range, between 40 and 400 Hz. This frequency is 1–0.1% lower than ultrasound, resulting in frictional forces and related temperatures that are proportionally reduced. In contrast to ultrasonic tip motion,
224 R.S. Hoffman · I.H. Fine · M. Packer Fig. 24.4. Phacoemulsification tip in sonic mode being grasped with an ungloved hand, demonstrating lack of heat generation Fig. 24.7. Schematic representation of the Staar cruise control Fig. 24.5. High-magnification view of SuperVac coiled tubing Fig. 24.6. When braking occlusions, regular phacoemulsification systems generate a flow surge in linear relation with the vacuum. The Super- Vac tubing dynamically limits the flow surge. As shown, the surge at 500 mmHg or higher is the same as for a regular phacoemulsification system operating at 200 mmHg
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Refractive Lens Surgery I. H. Fine
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Editors I. Howard Fine, MD Mark Pac
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Preface The first recorded time a h
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X Contents Chapter 14 AcrySof ReSTO
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Contributors Jorge L. Alio, MD, PhD
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1 The Crystalline Lens as a Target
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2 CORE MESSAGES Refractive Lens Exc
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na that have been observed with som
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piration through two separate incis
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6 R.S. Hoffman · I.H. Fine · M. P
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8 R.S. Hoffman · I.H. Fine · M. P
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10 R.S. Hoffman · I.H. Fine · M.
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12 M. Packer · I.H. Fine · R.S. H
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22 J.T. Holladay 4.1 Introduction T
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24 J.T. Holladay but only seven pre
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26 J.T. Holladay from morning to ni
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28 J.T. Holladay 4.3.2.2.3 Corneal
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30 J.T. Holladay rienced this condi
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32 J.T. Holladay many of these pati
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34 J.T. Holladay IOL eRx V 1336 =
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36 J.T. Holladay raised. A more tho
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38 J.T. Holladay rior segment laser
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40 D.D. Koch · L.Wang corneal refr
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42 D.D. Koch · L.Wang Table 5.1. M
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44 D.D. Koch · L.Wang Fig. 5.4. Nu
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46 D.D. Koch · L.Wang Fig. 5.5. Ce
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48 D.D. Koch · L.Wang ∑ Double-K
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50 L.D. Nichamin surgeon the abilit
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52 L.D. Nichamin Table 6.1. The Nic
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54 L.D. Nichamin 3.2 mm, its neglig
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56 L.D. Nichamin Fig. 6.4. The Nich
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58 L.D. Nichamin References 1. Anon
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60 S. Bylsma aphakic state. In cont
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62 S. Bylsma length),underwent full
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64 S. Bylsma K-Astigmatism
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66 S. Bylsma STIOL in the reversed
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68 S. Bylsma about the dynamics at
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8 Correction of Keratometric Astigm
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Fig. 8.2. AcrySof toric IOL implant
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Fig. 8.3. Mean absolute residual cy
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References 1. Hoffer KJ (1980) Biom
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10 The Eyeonics Crystalens Steven J
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Fig. 10.3. Under binocular conditio
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Fig. 10.6. Anterior movement of the
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Fig. 10.7. One- and 3-year data fro
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10.6 Postoperative Considerations C
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10. Dell SJ (2004) Objective eviden
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100 N.X. Nguyen · A. Langenbucher
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12 CORE MESSAGES Synchrony IOL H. B
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Fig. 12.1. The single-piece silicon
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12.5 Clinical Results Clinical tria
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Fig. 12.6. Retroillumination photog
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References 1. Fisher RF (1973) Pres
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124 F.M. Sarfarazi 13.1 The Nature
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126 F.M. Sarfarazi Fig. 13.4. Lens
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128 F.M. Sarfarazi Fig. 13.5. Mecha
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130 F.M. Sarfarazi Fig. 13.9. Secon
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132 F.M. Sarfarazi Fig. 13.14. Sche
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134 F.M. Sarfarazi Fig. 13.18. Work
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136 F.M. Sarfarazi References 1. Ma
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138 A. Mirshahi · E.Terzi · T. Ko
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15 The Tecnis Multifocal IOL Mark P
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Fig. 15.1. The Alcon AcrySof multif
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Fig. 15.4. Multifocal vs. monofocal
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16 Blue-Light-Filtering Intraocular
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Fig. 16.2. Cultured human RPE cells
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tion to benefiting from less exposu
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16.7 Blue-Light-Filtering IOLs and
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15. Marshall J, Mellerio J, Palmer
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17 CORE MESSAGES The Light-Adjustab
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Fig. 17.2 a-c. Cross-sectional sche
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17.4 Animal Studies Dr. Nick Mamali
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Fig. 17.8. A laser interferogram (l
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Page 202 and 203: 5. Tsuneoka H, Shiba T, Takahashi Y
Page 204 and 205: 200 J.L. Alio · A. Galal · J.-L.R
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Page 230 and 231: 25 CORE MESSAGES AMO Sovereign with
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Page 234 and 235: the Sovereign Compact (see Fig. 25.
Page 236 and 237: 234 M. Packer · R.S. Hoffman · I.
Page 238 and 239: 27 Conclusion: The Future of Refrac
Page 240 and 241: 240 Subject Index Contrast sensitiv
Page 242 and 243: 242 Subject Index P Pachymetry 53,
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