Ординатура / Офтальмология / Английские материалы / Jaypee Gold Standard Mini Atlas Series CORNEALTOPOGRAPHY_Agarwal, Jacob_2009
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MINI ATLAS SERIES: CORNEAL TOPOGRAPHY
FIGURE 11.13: Topography of a phakonit with an acritec IOL
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CHAPTER 11: CORNEAL TOPOGRAPHY IN CATARACT SURGERY
astigmatism had increased. We then took another topography. The picture on the right is of the topography after removing the sutures. The astigmatism increased to + 5.7 D. So, one should be very careful in analyzing the corneal topography when one does suture removal also. To solve this problem one can do an astigmatic keratotomy.
Phakonit is a technique devised by Dr Amar Agarwal in which the cataract is removed through a 0.9 mm incision. The advantage of this is obvious. The astigmatism created by a 0.9 mm incision is very little compared to a 2.6 mm phaco incision. Today with the rollable IOL and the Acritec IOL’s which are ultra-small incision IOL’s one can pass IOL’s through sub 1.4 mm incisions. This is seen clearly in Figures 11.12 and 11.13. Figure 11.12 shows the comparison aftert phakonit with a rollable IOL and Figure 11.13 with an Acritec IOL. If you will see the preoperative and the postoperative photographs in comparison you will see there is not much difference between the two. In this case a rollable IOL was implanted. The point which we will notice in this picture is that the difference between the preoperative photo and the one day postoperative photo is not much.
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INDEX
A
Anterior chamber phakic lens simulation 77
Automated anterior lamellar keratoplasty 253
Axial map 81
Axial power map 168
B
Back-scatter reflection 7 Bausch and Lomb’s orbscan 132 Beam and camera calibration 10
Bent/warped cornea 120, 123, 154
C
Conductive keratoplasty 308 history 309
conductive keratoplasty technology 311
early thermokeratoplasty procedures 309
the CK procedure 315 treatment of presbyopia 319
CK for post-cataract surgery astigmatism 325
CK for treating keratoconus 323
Convex mirror 338 Cornea 336
Corneal cross-sections 144 Corneal ectasia 26 Corneal topography 132 Curvature maps 4
Custom corneal ablation planner 85
D
Decentered excimer ablations 262
clinical definition 263 management 265
surgical correction 268
MINI ATLAS SERIES: CORNEAL TOPOGRAPHY
topography-guided treatment 271
wavefront-guided treatment 269
topographic decentration 264 wavefront aberrations 264
Densitometry 67, 69 Double vision 102 complaints 93
E
Efkarpides 120, 121 Elevation 3
map 48, 49
Elevation topography system 153 Equivalent K reading 71 Excimer laser 226
F
Ferrara/keraring 158
G
General quad map 12, 13, 15, 16, 20, 27, 28
Geometric optics 3
H
Holladay report 69
I
Iatrogenic keratectasia 36 effect’s of change in curvative
40
Intracorneal ring segments 254 Irregular astigmatism 210
clinical classification 213 corneal topography patterns
214
with defined pattern 215 with undefined pattern
216 diagnosis 213 etiology 211
dystrophic 212 postinfective 212 postsurgical 212 primary idiopathic 211 traumatic 212
evaluation 223 treatment 225
automatied anterior lamellar keratoplasty 253
contact lens management 254
excimer laser assisted by sodium hyaluronate 233
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INDEX
intracorneal ring segments 254
selective zonal ablation 229
surgical technique with excimer laser 226
topographic linked excimer laser ablation 243
K
K readings 139 Keratoconus screening 64
Keratometric mean power map 118
Keratometry 297, 337
L
Lazy-C on the axial power map 117, 119
M
Middle box 184
Multiple images after hyperopic LASIK 99
N
Night vision complaints 97 Normal band scale 122, 126, 127,
128
O
Optical pachymetry 54 Orbscan 2, 163, 342
examination 11 quad map 63
risk of ectasia indices 184 Overview display 51
P
Pachymetry 153, 297 map 60, 166, 171 PARM technique 292
Pentacam ocular scanner 44 Phakonit 355
Placido disc imaging systems 81 Placido type corneal topography
machine 341 Posterior corneal elevation maps
178
Posterior corneal surface 62 Posterior ectasia 135 Posterior elevation 149
map 114, 115
Power map 117, 149, 164, Predicted phoropter refractions
205
Pre-op LASIK screening 180 Presbyopia 292
Presbyopic LASIK 292 principle 293
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MINI ATLAS SERIES: CORNEAL TOPOGRAPHY
technique 294
hyperopic examples 299 myopic example 301 plano example 298
Primary posterior corneal elevation 34
Prolate and oblate cornea 293
R
Raytrace 3
Reading corneal elevation maps 174
Red flag 110, 112 Refractive display 52 Regular astigmatism 170 Residual bed thickness 36 Residual stromal bed 137
S
Scheimpflug image 86 Scheimpflug line 44 Selective zonal ablation 229 Slit-scan triangulation 8 Slit—scanning technology 83
Sodium hyaluronate 233 Specular reflection 6 Specular vs back-scattered
reflection 5 Steep cornea 102
T
Tomography display 66, 68 Topography 336, 343
astigmatic cornea 344 normal cornea 343
Topolink 243 Topometric display 53 Typical quad map 111
Y
Yellow flag 110, 112
Z
Zernike polynomials 203 pyramid 88
Zyoptix 201
diagnostic workstation 162 dual work station 133
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