To compare visual performance with the Biofinity multifocal (MF) contact lens monovision (MV) single-vision lens.A crossover study of 20 presbyopic patients was conducted. Patients were randomized first into either an MF or MV for 15 days each modality, a washout period between type. Measurements included monocular and binocular high- low-contrast logarithm minimum angle resolution acuity (VA) at distance near visions, contrast sensitivity function, stereoacuity.At days, lost fewer than two...

Purpose To compare the patterns of relative peripheral astigmatic refraction (tangential and sagittal power errors) eccentric eye length between progressing stable young-adult myopes. Methods Sixty-two right eyes 62 white patients participated in study, which 30 were nonprogressing myopes (NP group) for last 2 years 32 (P group). Groups matched mean spherical refraction, axial length, age. Peripheral measured along horizontal meridian up to 35 degrees eccentricity, respectively. Results...

Purpose: The purpose of this study was to evaluate the effect orthokeratology for different degrees myopia correction in relative location tangential (FT) and sagittal (FS) power errors across central 70° visual field horizontal meridian.Methods: Thirty-four right eyes 34 patients with a mean age 25.2 ± 6.4 years were fitted Paragon CRT (Mesa, AZ) rigid gas permeable contact lenses treat (−2.15 1.26D, range: −0.88 −5.25D). Axial peripheral refraction measured along Grand Seiko WAM5500...

Purpose . To show the distribution of ocular dominance as measured with sensory and eye sighting methods its potential relationship high low contrast LogMAR visual acuity in presbyopic subjects. Method Forty-four presbyopes (48.5 ± 3.5 years) participated this study. Ocular was determined by (hole-in-card) sensorial (+1.50 D lens induced blur) methods. According to detected each method (RE: right or LE: left eye), patients were classified type 1 (RE/RE), 2 (RE/LE), 3 (LE/RE) 4 (LE/LE)....

To characterize the axial and off-axis refraction across four meridians of retina in myopic eyes before after Orthokeratology (OK) LASIK surgery.Sixty right with a spherical equivalent (M) between - 0.75 to 5.25 D (cylinder <- 1.00 D) underwent (n = 26) or OK 34) treat myopia. Axial were measured an open-field autorefractometer stabilized treatments. Off-axis measurements obtained for horizontal (35° nasal temporal retina) vertical (15° superior inferior meridians, two oblique directions...

The purpose of this study was to characterize the central and peripheral refraction across horizontal meridian visual field without with a multifocal dominant design soft contact lens different add powers (+1.00 D +4.00 D) in emmetropic eyes. Twenty right eyes from 20 patients (mean spherical equivalent –0.06 ± 0.54 mean age 21.6 2.3 years were fitted Proclear Multifocal (Coopervision, Pleasanton, CA, USA). Lenses had +1.00 1.00 steps. measured along up 35° eccentricity nasal temporal...

The purpose of this study was to show the potential a commercial center-distance multifocal soft contact lens induce relative peripheral myopic defocus in eyes. Twenty-eight right eyes from 28 patients (mean age: 22.0 ± 2.0 years) were evaluated. measurements axial and off-axis refraction made using Grand-Seiko WAM-5500 open-field autorefractometer without with lenses (Proclear Multifocal D® Design) +2.00 D +3.00 add power applied randomly. Central mean spherical equivalent −2.24 1.33 D....

Objectives: To compare the clinical performance of Clearkone hybrid contact lens for treatment keratoconus against habitual patients. Methods: A total 33 eyes from 18 patients were fitted with Clearkone. High- and low-contrast visual acuity (HCVA LCVA), central corneal thickness (CCT), contrast sensitivity (CSF) recorded lenses (prestudy visit) after 1 week, 15 days, month wear prescribed Subjective vision comfort rated using analogue scales (VAS). Results: Three discontinued study, one...

Purpose . Quantifying adaptation to light distortion of subjects undergoing orthokeratology (OK) for myopia during the first month treatment. Methods Twenty-nine healthy volunteers (age: 22.34 ± 8.08 years) with mean spherical equivalent refractive error −2.10 0.93D were evaluated at baseline and days 1, 7, 15, 30 OK Light was determined using an experimental prototype. Corneal aberrations derived from corneal topography different pupil sizes. Contrast sensitivity function (CSF) analyzed...

To evaluate the combined effects of inherent ocular aberrations and induced with a multifocal soft contact lens (MFCL) after 15 days wear in presbyopic participants their influence on visual performance at distance near under high low contrast conditions.Forty (mean age, 48.7±3.4) presenting mean addition 1.53±0.58 D were fitted Biofinity Multifocal (CooperVision) included study. Measurements comprised monocular (100%) (10%) logMAR acuity (VA). Ocular obtained Hartmann-Shack aberrometer...

BackgroundThe aim of this study was to monitor refractive, topographic and biometric changes in Singaporean myopic children fitted with orthokeratology over a period 12-months.MethodsData from 62 eyes an Asian population corrected were retrospectively collected optometric clinic Singapore. Anterior segment parameters analysed Pentacam. Axial length measured using the IOLMaster refraction assessed by subjective examination before treatment after one night, week, one, three, six 12-months. A...

AbstractLight that enters the eye can be distorted due to several factors leading a poor visual performance. The purpose of this paper is describe and characterize light-emitting diode (LED) display system used in new device assess quality under high glare conditions. has central white LED surrounding LEDs distributed radial manner. Each controlled independently using special designed software. spectral power distribution color were assessed at different voltage intensities test response...

Purpose The purpose of this work was to evaluate the potential a novel custom-designed rigid gas permeable (RGP) contact lens modify relative peripheral refractive error in sample myopic patients. Methods Fifty-two right eyes 52 patients (mean [±SD] age, 21 [±2] years) with spherical errors ranging from −0.75 −8.00 diopters (D) and astigmatism 1.00 D or less were fitted experimental RGP (ExpRGP) designed create defocus retina. A standard (StdRGP) used as control same eye. measured without...

Purpose To describe a new methodology that derives horizontal posterior retinal contours from partial coherence interferometry (PCI) and ray tracing using the corneal topography. Methods Corneal topography PCI for seven visual field eccentricities correspondent to central 60 degrees of pole were obtained in 55 myopic eyes. A semicustomized eye model based on subject's Navarro was generated Zemax-EE software. The used compute optical path length directions where measurements obtained....

To evaluate the error in estimation of axial length (AL) with IOLMaster partial coherence interferometry (PCI) biometer and obtain a correction factor that varies as function AL crystalline lens thickness (LT). Optical simulations were produced for theoretical eyes using Zemax-EE software. Thirty-three combinations including eleven different (from 20 mm to 30 1 steps) three LT (3.6 mm, 4.2 4.8 mm) used. Errors obtained comparing measured constant equivalent refractive index 1.3549 actual...

Clinical relevance: Tear film assessment is essential in contact lens wearers and it can improve the success rates of fitting.Background: To compare short-term effect two lenses on pre-lens tear stability comfort: dual-focus (MiSight) a monofocal (Proclear 1-day).Methods: This randomised, double-masked, crossover study was performed twenty-eight healthy, myopic volunteers aged between 18 32 years (23.5 ± 4.1 years). Only one randomly chosen eye assessed. Distance vision refraction were...

To compare ocular and corneal inherent aberrations in the naked eyes of randomly selected children fitted with MiSight contact lenses (CL) for myopia control, versus corrected single-vision spectacles (control), over a 24-months period.Children aged 8 to 12 years, (-0.75 -4.00 D sphere) astigmatism (< -1.00 cylinder) were assigned lens study group (MiSight) or control (single-vision spectacles). The root mean square aberration (RMS) was determined as (RMS_C), high order RMS (HO_RMS_C), low...