Javier González Pérez

• PhD
• University of Santiago de Compostela

Purpose To study topographic epithelial and total corneal thickness changes in myopic subjects undergoing successful orthokeratology treatment in connection with the objective assessment of contact lens decentration. Methods A prospective-observational and non-randomized study in 32 Caucasian myopic eyes undergoing Ortho-k for 3 months. Total, epi...

Purpose The present study aimed to estimate how orientation position, recovery time, and contact lens decentration, associated with visual performance, may vary on several designs of the most recent toric silicone-hydrogel toric contact lenses in two-time different moments. Methods To evaluate the toric silicone-hydrogel toric contact lens positio...

Significance: The options that can help patients with congenital color vision defect, to a better professional and leisure adaptation, are very limited. Different haploscopic lenses can be considered, and their effects need to be investigated in patients with different defects. Purpose: The purpose of this study was to present and discuss the ef...

A statement of significance: For the first time, this study shows that corneas that previous undergone orthokeratology treatment do not respond differently to LASIK compared with previous soft contact lens wear experience. Purpose: To evaluate and compare the corneal morphology and visual outcomes of long-term soft and orthokeratology (OK) conta...

Objectives: To compare the visual-related quality of life in myopic subjects with different refractive treatments such as continuous wear of silicone-hydrogel contact lenses (CL), corneal refractive therapy (CRT), and laser-assisted in situ keratomileusis (LASIK). Methods: The National Eye Institute Refractive Error Quality of Life Instrument (N...

Purpose: To compare central corneal thickness (CCT) measured by standard ultrasound pachymetry (USP), and three non-contact devices in healthy eyes. Methods: A cross-sectional study of CCT measurement in 52 eyes of 52 healthy volunteers was done by a single examiner at Ocular Surface and Contact Lens Laboratory. Three consecutive measurements were...

Purpose: To assess and compare the visual-related quality of life in myopic subjects with different refractive treatments such as continuous wear of silicone-hydrogel (Si-H) contact lenses, corneal refractive therapy (CRT), and laser-assisted in situ keratomileusis (LASIK). Design: Cross-sectional study. Setting: Ocular Surface and Contact Lenses R...

To monitor changes in corneal structure and level of inflammatory mediators in tears of myopic patients following orthokeratology (OK) and laser in situ keratomileusis (LASIK). Sixty-two myopic subjects were analyzed in this prospective study. Thirty-two had worn Paragon CRT contact lenses and 30 underwent standard LASIK. Thirty-two control subject...

Background: The aim was to report the appearance of a pigmented ring in both eyes of two patients undergoing overnight orthokeratology. Methods: Two Caucasian patients, one male and one female, were fitted with orthokeratology lenses to correct myopia between -2.00 and -2.50 DS with Paragon corneal refractive therapy lenses worn overnight. Treat...

To study changes in tear film inflammatory mediators following continuous wear of silicone-hydrogel lenses and corneal refractive therapy with reverse geometry contact lenses. A prospective, case-control study. Twenty-eight subjects had worn silicone-hydrogel lenses on a 30-night continuous wear basis. Thirty-two subjects had worn corneal refractiv...

To evaluate the effect of an acoustic factor (AF) on the comparison of central corneal thickness (CCT) and peripheral corneal thickness (PCT) measurements with Orbscan II and Pentacam. The CCT and PCT at 1, 2, and 3 radial distances from the corneal apex were measured using Orbscan II and Pentacam in 22 right eyes of 22 healthy adults (7 men, 15 wo...

The goal of this study was to evaluate the pattern of initial adaptation of neophytes to corneal refractive therapy (CRT) for overnight corneal reshaping in terms of comfort and subjective visual performance at lens insertion at night and lens removal in the morning. Twenty-two young healthy subjects were enrolled in this study. All of them had bee...

To evaluate the reliability of three noninvasive pachometry methods against the ultrasound pachometer considered the gold standard. Central corneal thickness (CCT) was measured using a Paxis ultrasound (US) pachometer, Orbscan II, Pentacam, and Topcon SP-3000 specular microscope in 22 right eyes of 22 healthy adults (7 men, 15 women). Three repeate...

The TGDc-01 "PRA" (Ryazan State Instrument, Ryazan, Russia) tonometer is a new portable small-sized tonometer that measures intraocular pressure (IOP) through the eyelid. The purpose of this study is to assess the repeatability of the TGDc-01 IOP measurements by comparing them against those obtained with Goldmann tonometer and with those from Perki...

To determine the relevance of the different ocular optical components in the refractive state of young adults, paying special attention to the corneal topography represented by the asphericity value. Corneal topographies and ultrasonic biometries were obtained from 109 university students with different refractive errors (spherical equivalent range...

Objetivos: Determinación de la relevancia de diferentes componentes ópticos oculares en el estado refractivo de adultos jóvenes, con especial atención a la topografía corneal representada por el valor de asfericidad. Sujetos y métodos: Las topografías corneales y biometrías ultrasónicas fueron obtenidas en 109 estudiantes universitarios con diversa...

It is important to know how well the surface topography can be measured with current devices for corneal topographic analysis. There are several applications that need an accurate and precise method to measure corneal shape and variations, such as the effect of contact lens wear and the different refractive surgery techniques. The aim of this study...

Despite numerous studies that have considered the effects of extended wear of high-Dk soft contact lenses on ocular physiology, little attention has been paid to the impact of such lenses on central or peripheral corneal thickness and curvature. The present study aims to report the time course of changes in corneal thickness and curvature that acco...

To characterize the epithelial thickness profile and study the effects of long-term wear of hydrogel lenses on this profile. A cross-sectional study was designed. Epithelial thickness was evaluated in 15 subjects who had worn one of two types of low oxygen transmissibility (Dk) hydrogel contact lenses for an average of 10 years (range, 7-16) and co...

Pocos estudios han podido demostrar la mejoría del campo visual tras una pérdida de sensibilidad de origen glaucomatoso. En la mayoría de ellos, las recuperaciones campimétricas se producían al comienzo del tratamiento hipotensor; y, en menos casos, fueron progresivas y/o evolucionaron en varios años. Se presenta el caso de un paciente de 46 años a...

We investigated the effect of high Dk daily wear rigid gas permeable contact lenses on corneal topography. Eight young myopic subjects wore hard contact lenses for 21 days. Corneal topography was monitored using the EyeSys system. It was measured every day during the next 21 days after the fitting. We recorded the corneal radius of curvature at 16...

Ultrasonic measurements of corneal thickness (CT) more than 25 points from a 6-mm diameter area of the central cornea were used to create computerized CT maps. Two subjects were evaluated in different sessions by topographical ultrasonic pachometry. The thickness values were stored as a two-dimensional array z(x,y), whose indices refer to positiona...

Central and peripheral corneal thickness has been used increasingly to obtain information about physiologic and clinical conditions of the cornea. In this study, a new method based on ultrasonic pachometry for topographical corneal thickness measurement is described. Results suggest that the technique is reliable for clinical determination of globa...

Central corneal thickness of both eyes of 18 normal subjects was measured in a study comparing a Haag-Streit optical pachometer and an ultrasonic pachometer (Teknar Ophthasonic, preset velocity 1630 m/sec). All subjects were awake for 3 hours before measurements to reduce swelling of the cornea from overnight eye closure. Reliability was assessed b...

The effects of drugs on intraocular motility, retina function and central pathways in a drug addicts population have been studied. The study group were made up of 15 drug addicts. Fifteen healthy subjects who had never used drugs acted as a control group. Refractive state, accommodation, tonometry, assessment of pupillary reflexes, campimetry, visu...