To compare the optical and visual performance of a dual-focus (DF) contact lens used for myopia control with single-vision (SV) same material.A randomised, double-masked crossover study. Twenty-eight healthy, myopic volunteers between 18 32 years age (23.49 ± 4.07 years) participated in this The sensory dominant eye distance vision was determined. Refraction, best-corrected acuity (VA) aberrations 3 mm 5 pupil diameters were quantified without situ. Subjects fitted two designs: DF SV, both...

During accommodation, the eye undergoes significant structural changes, altering wavefront aberrations. So, this study aimed to evaluate changes in Zernike coefficients up 6th order with different accommodation demands and ages a large cohort of young adults, considering decrease pupil size accommodation. Aberrometric measurements for 210 healthy subjects aged 18–40 were performed irx3 (Imagine Eyes, Orsay, France), stimulating Badal system instrument, from 0 5 D. Each was rescaled...

Our objective was to validate a new device dedicated measure the light disturbances surrounding bright sources of under different potential variability. Twenty subjects were involved in study. Light distortion measured using an experimental prototype (light analyzer, CEORLab, University Minho, Portugal) comprising twenty-four LED arrays panel at 2 m. Sources variability included: intrasession and intersession repeated measures, pupil size (3 versus 6 mm), defocus (+0.50) correction for...

To compare the shape of anterior sclera candidates to scleral lens (ScCL) fitting with regular and irregular corneas analyze changes induced in sclero-conjunctiva after ScCL wear. Thirty-five eyes 18 subjects (19 16 corneas) were consecutively recruited. Three measures sclero-conjunctival taken Eye Surface Profiler (ESP, Eaglet Eye, Houten, The Netherlands). Tangent angles ocular sagittal heights (OC-SAG) analyzed at different chords from 13 17 mm nasal, temporal, superior inferior regions....

To evaluate neophyte contact lens wearers' fitting to rigid gas permeable (RGP) lenses in terms of wearing time, tear volume, stability, corneal staining, and subjective ratings, over a 1-month period time.Twenty-two young healthy subjects were enrolled for RGP on daily wear basis. The participants included this study never wore showed value under 10 McMonnies Questionnaire. Contact Lens Dry Eye Questionnaire, Visual Analog Scales, Schirmer test, film break-up time (BUT), staining grading...

ABSTRACT SIGNIFICANCE This study shows the optical and visual quality behavior of modern scleral lenses (SLs) in medium long term patients with irregular cornea (IC) regular (RC). PURPOSE The purpose this was to evaluate 12-month outcomes SL IC RC. METHODS Sixty-nine completed 12 months follow-up (99 eyes 27 RC). LogMAR high- low-contrast acuity, whole eye aberrometry, size (Light Disturbance Index, %) shape (BFCIrregSD, mm) night vision disturbances were measured at baseline habitual...

Abstract Purpose To assess and compare short‐term visual optical quality tear film stability between two dual‐focus (DF) prototype myopia control contact lenses (CLs) having different inner zone diameters. Methods Twenty‐eight myopic subjects were included in this randomised, double‐masked crossover study. Refraction, best‐corrected acuity (VA) measured at baseline (i.e., when uncorrected). Subjects then binocularly fitted with the DF CLs, only sensorial dominant eye being assessed. Lenses...

To evaluate how different amounts of induced spherical aberration (SA) affect the light distortion (LD) phenomena, tests were performed using an experimental device to measure (haloes, glare, and so on) a point source. simulate effect SA, eight phase plates between +0.300 −0.300 μm SA for 5-mm aperture used in random double-masked design. Measurements at distance 2 m darkened room 10 eyes five subjects with mean age 26.4±6.1 years refractive error −0.50±0.70 D. Data obtained natural pupil...

To assess the learning curve of a novel practitioner with minor previous experience scleral lenses (SL) fitting in initial 156 consecutive fittings irregular and regular corneas using trial.Prospective dispensing case series involving total 85 subjects (156 eyes), 122 eyes (IC Group) 34 (RC Group). All were fitted by same minimal knowledge practice on SL fitting. The first fits studied to estimate number trial required achieve optimal fit reorders required. results divided into 8...

Purpose: To report the fitting aspects, clinical findings, and symptoms over 12 months of scleral lens (SL) wear. Methods: Sixty-nine patients with irregular cornea due to ectasia or surgical procedures (IC group) regular corneas high ametropia (RC completed 12-month prospective follow-up period. Patients were evaluated at baseline, dispensing visit, 1 month, 3 months, 6 for assessment comfort, slitlamp findings. Comfort was assessed Ocular Surface Disease Index (OSDI) questionnaire Dry Eye...

Pharmacological dilation of the eye to have a larger pupil diameter may allow better understanding wavefront error changes with accommodation. This work aimed investigate whether Phenylephrine Hydrochloride (PHCl) application accommodative response and Zernike coefficient magnitude demand when computed common size. Sixteen right eyes healthy young subjects were measured commercial Hartmann–Shack aberrometer IRX3 (Imagine Eyes, Orsay, France) 30 min after two drops 1.0% PHCl applied. The...

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 evaluate the impact of different levels positive and negative defocus on light disturbance (LD) measures to understand how high-order aberrations (HOAs) topographic quality parameters may influence perception photic phenomena. Thirty young healthy subjects (21 females 9 males) attended this cross-sectional study. LD was evaluated with distortion analyzer (LDA) in natural accommodative cycloplegic conditions induced 1.00D. HOAs were taken for a mesopic (without cycloplegia) fixed 5 mm...

ObjectivesTo validate a previously developed algorithm based on the visibility of meibomian gland images obtained with Cobra fundus camera and to assess changes in glands scleral lens wearers over one year wear.MethodsInfrared meibography was from upper eyelid using forty-three volunteers (34.2 ± 10.1 years). Meibographies were classified into 3 groups: Group 1 = good subjective drop-out < 1/3 total area; 2 low 1/3; > 1/3. Meibomian metrics then calculated pixel intensity values...

Background: Myopia management contact lenses have been shown to successfully decrease the rate of eye elongation in children by changing peripheral refractive profile retina. Despite efforts scientific community, retinal response mechanism defocus is still unknown. The purpose this study was evaluate local electrophysiological retina with a myopia control lens (CL) compared single-vision CL same material. Methods: electrical activity and refraction 16 eyes (16 subjects, 27.5 ± 5.7 years, 13...

This narrative review synthesizes recent basic and clinical research on visual disturbances in low-light environments, highlighting evaluation techniques for these conditions. It focuses the degradation of acuity under dim lighting, exacerbated by pupil dilation, known as night vision (NVD). Key contributors to NVD include optical scattering, intraocular diffraction, ocular aberrations, uncorrected refractive errors, all significantly impacting quality life functional abilities. The also...