Low_resolution_Thesis_CDD_221009_public - Visual Optics and ...

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

CHAPTER 3 regression line, since it does not cross the origin; 2) we ignore the reliability of the information on nominal corneal ablation depth provided by the laser system; 3) the factor only relies on ablation depth on a single central location (which in the case of elevation maps of spherical surfaces from videokeratoscopy is obtained by interpolation). Ablation depth on PMMA ( m) 150 spherical surface ablations flat surface ablations 100 50 0 0 100 200 300 Nominal ablation depth on cornea (m) Correction on PMMA (D) 10 8 6 4 2 0 0 3 6 9 12 15 Nominal correction on cornea (D) (A) (B) Fig. 3.1. (A) Central ablation depths in flat –for two perpendicular meridians- (crosses) and spherical surfaces (solid circles). PMMA ablation depth was obtained from contact profilometry on flat surfaces, and videokeratography on spherical surfaces. Corneal ablation depth as provided by the laser system, for a given refraction correction and optical zone. The solid line represents the best-fitting line (slope = 0.55). (B) Refractive correction achieved on the spherical PMMA surfaces versus the intended correction on the cornea, as provided by the laser system. The solid line represents the best-fitting line (slope = 0.71). Alternatively, we obtained the ablation rate factor between corneal tissue and PMMA as that producing the attempted corneal correction in simulated postoperative corneas. This was obtained after an iterative process in which, at each iteration of the factor, all ablations in flat PMMA were transformed into corneal ablations and their central radii compared with the intended value. With this approach we obtained a PMMA-cornea correction factor of 2.65. Ablation depths in PMMA have to be multiplied by this value to obtain corneal ablation depths. Figure 3.1B shows a linear correlation between the nominal spherical correction on cornea and on PMMA. It should be noted that in Fig. 1B the refractive index of PMMA in the visible (n=1.49), rather than the corneal refractive index (n=1.377) was used to calculate the actual power change of PMMA ablated spheres. 106
REFRACTIVE SURGERY PMMA MODEL Ablation depth (microns) 0 -10 -20 -30 -40 -50 3 D 6 D 12 D -60 -6 -4 -2 0 2 4 6 Radial coordinate (mm) Fig. 3.2. Ablation profiles of three PMMA ablated flat surfaces for three nominal refractive myopic corrections (3, 6 and 12 D). Optical zone diameters were 7 mm for the 3-D and 6-D corrections and 5 mm for 12 D. These patterns were obtained by profilometry on ablated flat surfaces. These ablation patterns are not affected by ablation efficiency changes and represent the actual patterns for the cornea programmed into the laser system. 3.4.2. Ablation patterns from flat surfaces and from spherical surfaces Figure 3.2 shows the profiles of three ablated PMMA flat surfaces, for three different corrections and optical zones. These ablation patterns are not affected by ablation efficiency changes and represent the actual patterns programmed into the laser system. It should be noted that the ablation depth depends both on the attempted correction and optical zone, and therefore two different corrections (i.e. 6 and 12 D) may result in similar central ablation depths. Fig. 3.3. Best fitting conic of the actual corneal ablation pattern -crossescorresponding to the 12-D PMMA ablation pattern of Fig. 3.2, compared with the theoretical Munnerlyn and parabolic patterns -solid line- for the same correction and depth. The Munnerlyn pattern is calculated with the parameters of a typical preoperative cornea (radius 7.8 mm and asphericity -0.2). 107
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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
Page 55 and 56: INTRODUCTION 1.10.1. Tear studies A
Page 57 and 58: INTRODUCTION there are still many u
Page 59 and 60: INTRODUCTION 6. Evaluation and unde
Page 61 and 62: METHODS 2Chapter Chapter 2 - Method
Page 63 and 64: METHODS 2.1. MEASUREMENT OF OPTICAL
Page 65 and 66: METHODS In both profilometers, cust
Page 67 and 68: METHODS The measurement method that
Page 69 and 70: METHODS Fig. 2. 9. Set of points in
Page 71 and 72: METHODS Slit lamp Scheimpflug Camer
Page 73 and 74: METHODS representing the deviation
Page 75 and 76: METHODS 2.2.2.2. Ablation pattern f
Page 77 and 78: METHODS direction. These calculatio
Page 79 and 80: METHODS eye through the whole pupil
Page 81 and 82: METHODS (1993) power thresholds for
Page 83 and 84: METHODS alignment (frontal-illumina
Page 85 and 86: METHODS Fig. 2. 24. Example frame f
Page 87 and 88: METHODS 4) New image processing too
Page 89 and 90: METHODS Fig. 2. 28. Corrected entra
Page 91 and 92: METHODS Badal lens, corresponds to
Page 93: METHODS Each VA measurement consist
Page 99: REFRACTIVE SURGERY PMMA MODEL 3.1.
Page 102 and 103: CHAPTER 3 optimization of refractiv
Page 104 and 105: CHAPTER 3 These data demonstrate th
Page 108 and 109: CHAPTER 3 Figure 3.3 shows one of t
Page 110 and 111: CHAPTER 3 Ablation efficiency facto
Page 112 and 113: CHAPTER 3 considering the same set
Page 114 and 115: CHAPTER 3 3.5.3 Impact of correctio
Page 117: ABLATION PROPERTIES OF FILOFOCON A
Page 121 and 122: ABLATION PROPERTIES OF FILOFOCON A
Page 133: ABLATION PROPERTIES OF FILOFOCON A
Page 137: OPTIMIZED LASER PLATFORMS 5.1 ABSTR
Page 140 and 141: CHAPTER 5 pulses. Fluence, repetiti
Page 142 and 143: CHAPTER 5 ablations. The slit-confo
Page 144 and 145: CHAPTER 5 (Anera et al., 2003): d S
Page 146 and 147: CHAPTER 5 asymmetries also appeared
Page 148 and 149: CHAPTER 5 5.3.4. Ablation patterns
Page 150 and 151: CHAPTER 5 a) b) : 6.5 mm c) Fig. 5.
Page 152 and 153: CHAPTER 5 achieve proper reflection
Page 154 and 155: 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
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SOFT CONTACT LENS FITTING USING MOD
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SOFT CONTACT LENS FITTING USING MOD
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ON-EYE OPTICAL PERFORMANCE OF RIGID
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SOFT MONOFOCAL AND MULTIFOCAL CONTA
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SOFT MONOFOCAL AND MULTIFOCAL CONTA
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CORRELATION BETWEEN RADIUS AND ASPH
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CONCLUSIONS Conclusions This thesis
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CONCLUSIONS 5We have developed a pr
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CONCLUSIONS LIST OF METHODOLOGICAL
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CONCLUSIONS FUTURE RESEARCH LINES T
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CONCLUSIONS LIST OF PUBLICATIONS AN
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REFERENCES References AIZAWA, D., S
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REFERENCES PHOTODECOMPOSITION (APD)
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REFERENCES DORRONSORO, C., CANO, D.
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REFERENCES GISPETS, J., ARJONA, M.
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REFERENCES KOPF, M., YI, F., ISKAND
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REFERENCES MARCOS, S., DORRONSORO,
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REFERENCES NOVO, A., PAVLOPOULOS, G
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REFERENCES SAKIMOTO, T., ROSENBLATT
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REFERENCES WANG, L., DAI, E., KOCH,
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RESÚMENES pacientes reales fue com
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RESÚMENES experimentales de cirug
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RESÚMENES cada punto de las cornea
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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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