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Martínez Antón, Juan Carlos ; Plaza Ortega, Juan Manuel ; Alonso Fernández, José | SPIE | 2013-09-06We present an imaging technique for the 3D-form metrology of optical surfaces. It is based on the optical absorption in fluids situated between the surface and a reference. An improved setup with a bi-chromatic light source is fundamental to obt[...]texto impreso
Gómez Pedrero, José Antonio ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | Optical Society of America | 2001-07We present a new algorithm to calculate the optical imbalances and differential prismatic effects that appear when two eyes look at an object through correcting eyeglasses. These are important magnitudes in ophthalmic optics because large amount[...]texto impreso
Quiroga Mellado, Juan Antonio ; Alonso Fernández, José ; Zoido, J. ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1994-09-10Least-squares approximation can be used in image-based colorimetry once the set of sampling functions is selected. We discuss the accuracy obtained in earlier research, and we compare it with a better calculation method.texto impreso
Saez Landete, José ; Alonso Fernández, José ; Sánchez Brea, Luis Miguel ; Morlanes Calvo, Tomás ; Bernabeu Martínez, Eusebio | Optical Society of America | 2009-09-01Two-grating measurement systems are routinely employed for high-resolution measurements of angular and linear displacement. Usually, these systems incorporate zero reference codes (ZRCs) to obtain a zero reference signal (ZRS), which is used as [...]texto impreso
Peral Cerdá, Assumpta ; Alonso Fernández, José ; Canos Sanz, Joán ; Bernabeu Martínez, Eusebio | Elsevier Science B. V. | 2000-11The warpage of a set of six hard resin spherical lenses was measured when they were compressed by means of the tangential force exerted by a metal frame. The technique employed to measure the lenses improves over previous work both because great[...]texto impreso
Quiroga Mellado, Juan Antonio ; Gómez Pedrero, José Antonio ; Alonso Fernández, José ; Vargas, Javier | The Optical Society Of America | 2010-09-20This paper presents a deflectometric technique to measure the power of an ophthalmic lens as perceived by the user. It is based on a calibrated camera acting as a pinhole in order to measure ray deflection along the same path as the visual axis [...]texto impreso
Gómez Pedrero, José Antonio ; Rodríguez Ibáñez, Diego ; Alonso Fernández, José ; Quiroga Mellado, Juan Antonio | SPIE-International Society of Optical Engineering | 2015With the advent of techniques devised for the mass production of optical components made with surfaces of arbitrary form (also known as free form surfaces) in the last years, a parallel development of measuring systems adapted for these new kind[...]texto impreso
Saez Landete, José ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2005-05-30A method to obtain the absolute measure of the position is by means of the autocorrelation of two zero reference marks. In one-axis measurement systems one dimensional mark are used and the design of these marks is relatively complex. When the m[...]texto impreso
Saez Landete, José ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2005-01-10The grating measurement systems can be used for displacement and angle measurements. They require of zero reference codes to obtain zero reference signals and absolute measures. The zero reference signals are obtained from the autocorrelation of[...]texto impreso
Peral Cerdá, Assumpta ; Alonso Fernández, José ; Gómez Pedrero, José Antonio | The Optical Society (OSA) | 2018-11-15Evaluation of the Meibomian glands morphology is becoming a popular assessment for dry eye. This evaluation is usually done by imaging the glands on the everted lids while they are illuminated with infrared light. Nowadays techniques to determin[...]texto impreso
Crespo Vázquez, Daniel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2002-03-01The term generalized grating imaging is used to describe the process of image formation of a grating using only another grating as imaging system. The moiré and the Lau effects could be regarded as particular cases of such a process. Here we dea[...]texto impreso
Crespo Vázquez, Daniel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | Optical Society of America | 2000-07It is a well-known fact that one grating can act as an imaging element for another grating when the first is illuminated with an extended monochromatic light source. The conditions for image formation in such a system are studied when the finite[...]texto impreso
Saez Landete, José ; Salcedo Sanz, Sancho ; Rosa Zurera, Manuel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | IEEE (Institute of Electrical and Electronics Engineers) | 2007-07In grating measurement systems, a reference signal is needed to achieve an absolute measurement of the position. The zero reference signals are normally obtained illuminating two identical superimposed zero reference codes (ZRCs) and registering[...]texto impreso
García Rodriguez, Lucas ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2004-05-31The pseudo-imaging process in a system consisting of two periodic gratings and illuminated by an incoherent polychromatic and finite extension source placed at a finite distance from the gratings is studied. An analytical expression of the irrad[...]texto impreso
Peral Cerdá, Assumpta ; Alonso Fernández, José ; García García, Concepción ; Niño Rueda, Cristina ; Calvo del Bosque, Patricia | Contact Lens Association of Ophthalmologists, Inc. | 2016-11Objective: To evaluate the efficacy of a cleansing eyelid wipe in reducing the microbiota present on the ocular surface before cataract surgery. Methods: A single-center, prospective, single-blind phase IV study was conducted at the University C[...]
