Low_resolution_Thesis_CDD_221009_public - Visual Optics and ...

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

CHAPTER 2 of the instrument can also be found in (Dorronsoro et al., 2003a, Llorente et al., 2004b, Llorente et al., 2007). The authors of this work were: Carlos Dorronsoro, Lourdes Llorente, Daniel Cano, Sergio Barbero, Benjamín Alonso- Fernández, Laura Remón and Susana Marcos. 62
METHODS 2.1. MEASUREMENT OF OPTICAL SURFACES GEOMETRY Different instruments have been used in this thesis for the experimental assessment of optical surfaces. Fig. 2. 1 shows examples of raw data obtained with the different instruments used to measure optical surfaces all throughout this thesis. Non-contact optical profilometry was used for in vitro measurements: on spherical surfaces on Chapters 3, 5 and 6, and on flat surfaces on Chapters 4 and 5. Placido disk videokeratoscopy was used in-vivo in Chapters 3 and 9 and in-vitro in Chapter 8. Scheimpflug Imaging was used for in vitro measurements in Chapter 6 of this thesis, and for in-vivo measurements in Chapter 7. a) b) c) d) c) d) a) b) Fig. 2. 1. Examples of raw data obtained with the different instruments used to measure optical surfaces in this thesis. (a) Non-contact optical profilometry on spherical surfaces. (b) Non-contact optical profilometry on flat surfaces. (c) Atlas Videokeratoscopy. (d) Pentacam Scheimpflug Imaging. Both the anterior and posterior surfaces of the cornea are measured. 2.1.1. Surface profilometry In recent years, there has been considerable progress in surface geometry measurement. Contact and non-contact profilometry systems, with different measurement principles, are both capable of accurately and reliably measuring surface topographies on the scale of millimeters to nanometers. However, the optical surfaces used in this thesis are very demanding for profilometric instruments, specially curved surfaces used in the artificial eyes. For that reason, different systems were used depending on the requirements. In all of them, software modifications or measurement procedure adjustments were needed to reach the combination of precision and measurement range demanded by these particular samples. In Chapter 3 three different profilometry systems were evaluated: one contact profilometer for spherical surfaces, another contact profilometer for flat surfaces, and also a new generation system for non-contact profilometry. This last system was used in the rest of the thesis, both for flat and spherical surfaces. The samples used in this thesis are mainly flat and curved artificial corneas. The measurements on the artificial corneas are very demanding for the instruments, due to their low radius of curvature (8 mm). The maximum difference between the surfaces to be compared (for example before and after surgery) is very small, of the order of 40 microns, while the range to be measured is of the order of millimeters (from the apex to the periphery of the cornea). Furthermore, the quality of the surface (of critical importance in the precision of the measurement) changes from optical smoothness before surgery to significant roughness after it. As a consequence, several instruments were tested during this thesis. They had to be modified to some extent, and enhanced measurement procedures (with improved accuracy) had to be developed. 63
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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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Page 14 and 15: We thank José Antonio Sánchez-Gil
Page 16 and 17: BOZR Back Optic Zone Radius BCVA Be
Page 19 and 20: INTRODUCTION 1.1. MOTIVATION The fr
Page 21 and 22: INTRODUCTION 1.2. THE OPTICAL SYSTE
Page 23 and 24: INTRODUCTION Myopia is a very commo
Page 25 and 26: INTRODUCTION a point focus: the dif
Page 27 and 28: INTRODUCTION system, and tilt repre
Page 29 and 30: INTRODUCTION term Z 0 2 stands for
Page 31 and 32: INTRODUCTION which image was shadow
Page 33 and 34: INTRODUCTION The defocus Zernike te
Page 35 and 36: INTRODUCTION 1.4.6.3. Internal Aber
Page 37 and 38: INTRODUCTION 1.5.2.3. Alternating v
Page 39 and 40: INTRODUCTION and further-more, at l
Page 41 and 42: INTRODUCTION alcohol is used to loo
Page 43 and 44: INTRODUCTION changes in reflectivit
Page 45 and 46: INTRODUCTION Marcos et al. (Marcos
Page 47 and 48: INTRODUCTION 1.7.3. Ablation effici
Page 49 and 50: INTRODUCTION corneal surface may be
Page 51 and 52: INTRODUCTION Algorithm design: The
Page 53 and 54: 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: METHODS 2Chapter Chapter 2 - Method
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 106 and 107: CHAPTER 3 regression line, since it
Page 108 and 109: CHAPTER 3 Figure 3.3 shows one of t
Page 110 and 111: 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
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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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