We investigated whether the sensory impairments of amblyopia are associated with a decrease in eye position stability (PS).The positions both eyes were recorded simultaneously three viewing conditions: binocular, monocular fellow (right for controls), and amblyopic (left controls). For conditions, movements covered also (open-loop testing). Bivariate contour ellipses (BCEAs), representing region over which found 68.2% time, calculated normalized by log transformation.For controls, there no...

In Brief Purpose: The authors examined the fixation stability patterns of people with age-related macular degeneration (AMD) using MP-1 microperimeter and describe a method to bypass some calibration artifacts that can influence results. Method: preferred retinal locus (PRL) 37 eyes AMD fovea's location relative middle optic disc 10 experienced controls were measured. For patients, characteristics such as former location, PRL distance, analyzed. Results: controls, mean foveal distance...

Abstract The aim of this study was to explore the plasticity fixation in patients with central vision loss. Most these use preferred retinal loci (PRLs) healthy eccentric part retina fixate, but stability and location are not always optimal for best visual performance. This examined whether a new PRL can be trained changes ocular motor control transfer into better reading Six age-related macular degeneration participated study. Fixation measurements, microperimetry, auditory biofeedback...

Abstract Background To investigate whether patients with binocular reading inhibition due to central vision loss benefit from a new biofeedback (BF) rehabilitation method that aimed at improving fixation stability and establishing correspondence between the monocular preferred retinal loci (PRLs) on functioning retina in both eyes. Methods Thirty-three bilateral macular disease participated 10 training sessions consisting of 10-min visual stimulation for each eye stabilize relocate PRL (if...

purpose. This study examined whether changes in fixation stability and location are good predictors of visual acuity after successful macular hole surgery. methods. Ten patients with were tested before surgery at 1 3 months Visual was measured the ETDRS; assessed MP-1 Microperimeter (Nidek Technologies Srl., Vigonza, PD, Italy). The quantitative measure calculated a bivariate contour ellipse area (BCEA). Fixation shift evaluated using differential map analysis feature Microperimeter....

The authors examined the fixation stability of patients with age-related macular degeneration (AMD) and large interocular acuity differences, testing them in monocular binocular viewing conditions. relationship between visual performance during was also studied.Twenty AMD participated. Their distance acuities were measured ETDRS charts. Fixation better worse eye recorded monocularly MP-1 microperimeter (Nidek Technologies Srl., Vigonza, PD, Italy) binocularly an EyeLink tracker (SR Research...

Purpose To evaluate the effectiveness of a perceptual learning technique for improving reading performance patients with central vision loss and to explore whether this generalizes other visual functions. Methods Ten were trained binocularly, in four consecutive sessions, serially presented words printed at each patient’s acuity limit. Patients read 10 blocks 100 session. They encouraged whole word discouraged letter by letter. Assessment sessions before after training measured fixation...

We studied changes in visual acuity (VA), fixation stability, and location of the preferred retinal locus (PRL) after treatment for unilateral neovascular age-related macular degeneration (AMD) previously untreated eyes. Concomitant PRL, VA fellow eye were also analyzed.Pre- posttreatment tests acuity, PRL both treated eyes performed on 13 patients undergoing three monthly intravitreal injections ranibizumab one eye.For there improvements stability but no PRL. No significant any variables...

We present a new method for identifying the absolute location (i.e., relative to optic disc) of preferred retinal (PRL) simultaneously two eyes patients with central vision loss. For this, we used binocular eye-tracking system that determines pupillary axes both without user calibration routine.During monocular viewing, measured axis and angle between it visual (angle Kappa) 10 normal vision. also determined their fovea middle disc MP-1 microperimeter. Then, created transformation...

The goal of this study was to explore binocular coordination during fixation in patients with age-related macular degeneration (AMD) and investigate whether there is a shift eye position when the viewing condition changes from monocular.Sixteen people normal vision 12 AMD were asked look at 3 deg target both eyes each individually while fellow covered by an infrared filter. Fixational movements recorded for EyeLink eye-tracker all conditions. end every period calculated eye.All as well...

The authors present a computer-based method for evaluating the visual acuity of patients with age-related macular degeneration (AMD). It incorporates four features known to improve acuity: high contrast, white optotypes on black background reduce intraocular scatter, proportional layout effects crowding, and multiple minimize fixation instability maximize likelihood optotype detection.Experiment 1 evaluated best-eye 24 AMD using ETDRS chart three versions Tumbling E test: background, single...

The effects of stimulus eccentricity, visual angle, and fixation on linear vection (sensation self-translation induced by large moving scenes) were examined in healthy young people. Three aspects measured: latency, total time, strength. results showed that when peripheral central stimuli are equal area, they induce similar vection, but only presented with a cross. When without cross, more effective inducing than stimuli. In addition, cross elicited Fixation had no influence the These...

purpose. The contribution of peripheral vision in inducing self-motion (vection) was investigated people with bilateral age-related macular degeneration (AMD). methods. Eleven patients AMD and dense central scotomas no islands functional retina 12 age-matched control subjects were exposed to random-dot patterns projected on a large screen. dots either moved from left right, linear vection, or rotated about the roll axis, vection. Latency, total vection time, objective subjective measures...

Visual performance in patients with bilateral central field loss is related to fixation stability. This study evaluated the repeatability of visual-fixation parameters loss, measured MP-1 microperimeter for durations on order 15 30 seconds.Bivariate contour ellipse area (BCEA), and eccentricity meridian preferred retinal locus (PRL) were determined 56 eyes patients, sampled at two investigational sites. Repeatability agreement assessed by estimating 95% limits each parameter from...

ABSTRACT Purpose People with normal vision perform activities of daily living binocularly, while changing viewing distance frequently and effortlessly. Typically, in patients age-related macular degeneration (AMD), fixation stability is recorded monocular instruments at a fixed (i.e. optical infinity) to determine the location precision preferred retinal loci (PRLs)—the part functional retina that fulfills role pseudo-fovea. Fixation these has been related performance on visual tasks shorter...

Fixation examination with the MP-1 microperimeter (Nidek Technologies Srl., Vigonza, PD, Italy) determines preferred retinal loci and fixation stability in patients central vision loss. It is typically done for periods of 15 to 30 s as per manual's recommendations, which are arbitrary. In this study, we examined (1) whether depends on duration recording (2) changes over time.Raw eye-position data from 76 bilateral loss (mean age = 80 ± 9.6 yrs) who had recordings MP-1of at least were used....

Abstract Purpose In this study we evaluated the reading accessibility index ( ACC ) and a quality of grid as assessment tools for outcome measures rehabilitation patients with central vision loss. Methods Reading performances on MNR ead chart www.precision-vision.com were reviewed from our research database. Participants 24 controls normal [mean age: 34 SD , 14) years] 61 bilateral loss 81 9) among which subgroup 18 age, 76 13) had undergone perceptual learning training rehabilitation. The...

Purpose: To investigate the effect of disease progression on monocular preferred retinal locus (PRL) better eye (BE) and worse (WE) patients with central vision loss. Methods: Fifty-one bilateral macular diseases were included. The PRL was recorded for each (N = 102 eyes) MP-1 microperimeter in two visits that 458 ± 249 days apart. For visit, distance from former fovea, polar angle, scotoma size measured. change location visit 1 to 2 evaluated differential map analysis. Results: Scotoma...

Abstract Purpose There are conflicting reports as to whether there is a binocular advantage or disadvantage when reading with central vision loss. This study examined summation in patients macular degeneration. Methods Seventy‐one bilateral loss [mean age: 63 (S.D. = 21) years] participated. Reading performances during and monocular viewing the better eye (i.e., best visual acuity) were evaluated using different versions of Italian MNREAD chart ( www.precision‐vision.com ). Fixation...