Low_resolution_Thesis_CDD_221009_public - Visual Optics and ...

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$XXX Congress of the European Society of Cataract and Refractive ...$

CORRELATION BETWEEN RADIUS AND ASPHERICITY A.3.5. Fits and data analysis All elevation maps were exported from the instruments and analyzed in Matlab (The Mathworks, Natick, MA, USA). For the corneal surfaces and simulations, we fitted the central 6 mm (diameter) of the elevation maps to quadrics (Navarro et al., 2006), whose general equation is 2 2 2 x y z 1 (A.1) Rotationally symmetric quadrics have the restriction = . When fitting corneal surfaces, we found that in all cases the best fit corresponded to an ellipsoid, i.e. , and are positive. Radii and asphericities of the two main meridians are calculated as R x / , R y / , Q x / 1 and Q y / 1. In all cases, we allowed free translation in space of the fitting surface, but no rotation. The profiles of the intraocular lens were fitted by conics (See Section 2.2.1 and Eq. 2.1). In this case we allowed both free translation and rotation of the fitting curve, because we found that the profiles were tilted. A.4. RESULTS Fig. A.1. Scheme of the experimental methodology. Experimental data are obtained from real eyes with a Scheimpflug-imaging topographer (left) and a Placido-disk topographer (center), and from a intraocular lens with an optical profilometer (right). The data are exported to a computer, and fitted by ellipsoids or ellipses, described a given radius and asphericity. A.4.1. Experimental measurements Figure A.2 shows the correlation plot (radius vs. asphericity) for the data measured with Pentacam for the three subjects. Figure A.2(a) shows the data for the anterior cornea, and Fig. A.2(b) for the posterior cornea. For the six datasets, radii and asphericities are strongly and significantly correlated, except the posterior surface of Subject 2 (p=0.07, black dots; nonetheless, when the data were fitted to nonrotationally-symmetric ellipsoids, there was a significant correlation in the vertical meridian, p=0.02). Table A.1 shows the correlation coefficients (r) and p-values (p) for these measurements. These data correspond to fits to rotationally-symmetric ellipsoids, and the results hold (some of them with improved correlations) for nonrotationally symmetric ellipsoids. 247
ANNEX A 0 a 0.6 b -0.1 0.4 Q Q -0.2 0.2 -0.3 0 7.5 7.6 8 8.1 R (mm) 6.2 6.4 6.6 6.8 R (mm) Fig. A.2. Correlation between fitted radius and asphericity for Pentacam data of corneal anterior (a) and posterior (b) surface. Diamonds: Subject 1. Circles: Subject 2. Triangles Subject 3. In order to find the degree of correlation in a broader set of conditions, we analyzed a dataset of repeated Pentacam measurements on patients before and after LASIK, at different time points, taken by three different operators in a clinical environment, and measurements of non-operated control subjects taken in a laboratory environment,. This dataset consists of measurements from different subjects obtained on different days (3-6 measurements per day). In order to analyze the dispersion in these consecutive measurements, the average value of radius and asphericity for each subject and session was subtracted from all the measurements of the session. Figure A.3(a) shows the correlation between the dispersion in R and Q of the anterior corneal surface, for all patients pre- and post-LASIK, and for all controls. Figure A.3(b) shows the results for the posterior surface on the same eyes. The correlations are very strong (r=0.93 and p
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Doctoral thesis Corneal Ablation an
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Contents Corneal Ablation and Conta
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2.2.1. Fitting surfaces............
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5.3.3. Ablation efficiency factors
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10.5. DISCUSSION...................
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We thank José Antonio Sánchez-Gil
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BOZR Back Optic Zone Radius BCVA Be
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INTRODUCTION 1.1. MOTIVATION The fr
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INTRODUCTION 1.2. THE OPTICAL SYSTE
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INTRODUCTION Myopia is a very commo
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INTRODUCTION a point focus: the dif
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INTRODUCTION system, and tilt repre
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INTRODUCTION term Z 0 2 stands for
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INTRODUCTION which image was shadow
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INTRODUCTION The defocus Zernike te
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INTRODUCTION 1.4.6.3. Internal Aber
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INTRODUCTION 1.5.2.3. Alternating v
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INTRODUCTION and further-more, at l
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INTRODUCTION alcohol is used to loo
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INTRODUCTION changes in reflectivit
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INTRODUCTION Marcos et al. (Marcos
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INTRODUCTION 1.7.3. Ablation effici
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INTRODUCTION corneal surface may be
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INTRODUCTION Algorithm design: The
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INTRODUCTION contact lenses the fie
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INTRODUCTION 1.10.1. Tear studies A
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INTRODUCTION there are still many u
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INTRODUCTION 6. Evaluation and unde
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METHODS 2Chapter Chapter 2 - Method
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METHODS 2.1. MEASUREMENT OF OPTICAL
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METHODS In both profilometers, cust
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METHODS The measurement method that
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METHODS Fig. 2. 9. Set of points in
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METHODS Slit lamp Scheimpflug Camer
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METHODS representing the deviation
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METHODS 2.2.2.2. Ablation pattern f
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METHODS direction. These calculatio
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METHODS eye through the whole pupil
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METHODS (1993) power thresholds for
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METHODS alignment (frontal-illumina
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METHODS Fig. 2. 24. Example frame f
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METHODS 4) New image processing too
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METHODS Fig. 2. 28. Corrected entra
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METHODS Badal lens, corresponds to
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METHODS Each VA measurement consist
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REFRACTIVE SURGERY PMMA MODEL 3.1.
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CHAPTER 3 optimization of refractiv
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CHAPTER 3 These data demonstrate th
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CHAPTER 3 regression line, since it
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CHAPTER 3 Figure 3.3 shows one of t
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CHAPTER 3 Ablation efficiency facto
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CHAPTER 3 considering the same set
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CHAPTER 3 3.5.3 Impact of correctio
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ABLATION PROPERTIES OF FILOFOCON A
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OPTIMIZED LASER PLATFORMS 5.1 ABSTR
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CHAPTER 5 pulses. Fluence, repetiti
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CHAPTER 5 ablations. The slit-confo
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CHAPTER 5 (Anera et al., 2003): d S
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CHAPTER 5 asymmetries also appeared
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CHAPTER 5 5.3.4. Ablation patterns
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CHAPTER 5 a) b) : 6.5 mm c) Fig. 5.
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CHAPTER 5 achieve proper reflection
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CHAPTER 5 Both the ablation algorit
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HYBRID PORCINE/PLASTIC MODEL 6.1. A
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CHAPTER 6 6.3.1. Hybrid porcine-pla
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CHAPTER 6 is detected. Therefore, i
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CHAPTER 6 no preferential orientati
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ANTERIOR AND POSTERIOR CORNEAL ELEV
Page 171 and 172: ANTERIOR AND POSTERIOR CORNEAL ELEV
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Page 187: SOFT CONTACT LENS FITTING USING MOD
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Page 194: ON-EYE OPTICAL PERFORMANCE OF RIGID
Page 198 and 199: ON-EYE OPTICAL PERFORMANCE OF RIGID
Page 212: SOFT MONOFOCAL AND MULTIFOCAL CONTA
Page 216: SOFT MONOFOCAL AND MULTIFOCAL CONTA
Page 220 and 221: CORRELATION BETWEEN RADIUS AND ASPH
Page 230: CONCLUSIONS Conclusions This thesis
Page 233 and 234: CONCLUSIONS 5We have developed a pr
Page 236: CONCLUSIONS LIST OF METHODOLOGICAL
Page 240 and 241: CONCLUSIONS FUTURE RESEARCH LINES T
Page 242 and 243: CONCLUSIONS LIST OF PUBLICATIONS AN
Page 244 and 245: REFERENCES References AIZAWA, D., S
Page 246 and 247: REFERENCES PHOTODECOMPOSITION (APD)
Page 248 and 249: REFERENCES DORRONSORO, C., CANO, D.
Page 250 and 251: REFERENCES GISPETS, J., ARJONA, M.
Page 252 and 253: REFERENCES KOPF, M., YI, F., ISKAND
Page 254 and 255: REFERENCES MARCOS, S., DORRONSORO,
Page 256 and 257: REFERENCES NOVO, A., PAVLOPOULOS, G
Page 258 and 259: REFERENCES SAKIMOTO, T., ROSENBLATT
Page 260: REFERENCES WANG, L., DAI, E., KOCH,
Page 263 and 264: RESÚMENES pacientes reales fue com
Page 265 and 266: RESÚMENES experimentales de cirug
Page 267 and 268: RESÚMENES cada punto de las cornea
Page 269 and 270: RESÚMENES plástico medidas anteri
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RESÚMENES 8 Evaluación óptica de
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RESÚMENES 9 Prestaciones ópticas
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RESÚMENES 10 Calidad óptica y cal
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RESÚMENES A Correlación entre rad
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CONCLUSIONES clínicos. La descripc
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CONCLUSIONES 12 Las superficies ocu
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CONCLUSIONES IMPLICACIONES DE ESTA
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CONCLUSIONES contribuyen a la compr
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(y muchísimo más difícil). Me da
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