scholarly journals Effect of Age, Sex, Stimulus Intensity, and Eccentricity on Saccadic Reaction Time in Eye Movement Perimetry

2019 ◽  
Vol 8 (4) ◽  
pp. 13 ◽  
Author(s):  
Deepmala Mazumdar ◽  
Najiya S. Kadavath Meethal ◽  
Manish Panday ◽  
Rashima Asokan ◽  
Gijs Thepass ◽  
...  
Keyword(s):  
Reaction Time ◽  
Eye Movement ◽  
Stimulus Intensity ◽  
Saccadic Reaction Time ◽  
Effect Of Age ◽  
Eye Movement Perimetry

scholarly journals Saccadic reaction time in mirror image sectors across horizontal meridian in eye movement perimetry

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Deepmala Mazumdar ◽  
Najiya S. Kadavath Meethal ◽  
Ronnie George ◽  
Johan J. M. Pel
Keyword(s):  
Reaction Time ◽  
Eye Movement ◽  
Classification Accuracy ◽  
Healthy Subjects ◽  
Saccadic Reaction Time ◽  
Automated Perimetry ◽  
Standard Automated Perimetry ◽  
Evaluation Phase ◽  
Four Levels ◽  
Eye Movement Perimetry

AbstractIn eye movement perimetry (EMP), the saccadic reaction time (SRT) to ‘seen’ visual stimuli are delayed in glaucoma. Evaluating SRT behaviour in hemi-field sectors could refine its clinical implication. The development phase included 60 controls retrospectively and for the test cohort in evaluation phase, another 30 healthy subjects and 30 glaucoma patients were recruited prospectively. The SRTs were used to calculate the normative limits within 5 predefined hemi-field sectors. Scores were assigned to probabilities for SRT at the level of 5%, 2.5% 1% and 0.5%. Per sector pair, a probability score limit (PSL) was calculated at each of the four levels and were compared with the scores obtained from the test cohort. The classification accuracy ‘normal versus abnormal’ was assessed for PSL in EMP and compared with glaucoma hemi-field test in standard automated perimetry. We found no statistically significant differences in SRTs between the mirror sectors in healthy subjects. The PSL at 2.5% had moderate classification accuracy with a specificity of 77% and sensitivity 70%. This could be suggestive of an SRT delay in the overall visual field in glaucoma.

scholarly journals Comparison of saccadic reaction time between normal and glaucoma using an eye movement perimeter

2014 ◽  
Vol 62 (1) ◽  
pp. 55 ◽  
Author(s):  
Ronnie George ◽  
Jvan der Steen ◽  
Deepmala Mazumdar ◽  
JJM Pel ◽  
Manish Panday ◽  
...  
Keyword(s):  
Reaction Time ◽  
Eye Movement ◽  
Saccadic Reaction Time

scholarly journals Effect of stimulus intensity on manual and saccadic reaction time

2004 ◽  
Vol 66 (4) ◽  
pp. 535-544 ◽  
Author(s):  
Piotr Jaśkowski ◽  
Kinga Sobieralska
Keyword(s):  
Reaction Time ◽  
Stimulus Intensity ◽  
Saccadic Reaction Time

scholarly journals The Effect of Cataract on Eye Movement Perimetry

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
G. Thepass ◽  
J. J. M. Pel ◽  
K. A. Vermeer ◽  
O. Creten ◽  
S. R. Bryan ◽  
...  
Keyword(s):  
Reaction Time ◽  
Visual Field ◽  
Eye Movement ◽  
Mixed Model ◽  
Sensitivity Threshold ◽  
Peripheral Stimulus ◽  
Eye Tracker ◽  
Change In Mean ◽  
Cataract Patients ◽  
Eye Movement Perimetry

Purpose. To determine how different grades of cataract affect sensitivity threshold and saccadic reaction time (SRT) in eye movement perimetry (EMP).Methods. In EMP, the visual field is tested by assessing the saccades that a subject makes towards peripheral stimuli using an eye tracker. Forty-eight cataract patients underwent pre- and postoperative EMP examination in both eyes. The subjects had to fix a central stimulus presented on the eye tracker monitor and to look at any detected peripheral stimulus upon its appearance. A multilevel mixed model was used to determine the factors that affected the sensitivity threshold and the SRT as a function of cataract grade.Results. We found no effect of cataract severity (LOCS III grades I through IV) on SRT and the sensitivity thresholds. In cataract of LOCS III grade V, however, we found an increase by 27% and 21% (p<0.001), respectively, compared to the SRT and the sensitivity threshold in LOCS III grade I. Eyes that underwent cataract surgery showed no change in mean SRTs and sensitivity thresholds after surgery in LOCS III grade IV and lower.Conclusion. The present study shows that EMP can be readily used in patients with cataract with LOCS III grade IV and below.

scholarly journals Saccadic reaction time and ocular findings in phenylketonuria

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Susanne Hopf ◽  
Caroline Nowak ◽  
Julia B. Hennermann ◽  
Irene Schmidtmann ◽  
Norbert Pfeiffer ◽  
...  
Keyword(s):  
Reaction Time ◽  
Saccadic Reaction Time ◽  
Ocular Findings
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