Low-cost, smartphone based frequency doubling technology visual field testing using virtual reality (Conference Presentation)

2017 ◽  
Author(s):  
Karam A. Alawa ◽  
Mohamed Sayed ◽  
Alejandro Arboleda ◽  
Heather A. Durkee ◽  
Mariela C. Aguilar ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Visual Field ◽  
Low Cost ◽  
Frequency Doubling ◽  
Field Testing ◽  
Visual Field Testing ◽  
Frequency Doubling Technology

Testing Visual Fields in Children

2022 ◽  
pp. 67-85
Author(s):  
Jacky K. W. Kong
Keyword(s):  
Visual Field ◽  
Pediatric Population ◽  
Visual Fields ◽  
Frequency Doubling ◽  
Field Testing ◽  
Visual Field Testing ◽  
Frequency Doubling Technology ◽  
Kinetic Perimetry ◽  
Finger Counting ◽  
Physical Abilities

Visual fields in the pediatric population are an essential part of the eye exam that remain challenging to even the most experienced clinicians. Becoming educated in the multiple ways a child's visual field can be tested regardless of age and cognitive and physical abilities will allow the clinician to gain better insight into the child's function and in some cases, allow the clinician to identify pathological or neurological anomalies in the visual pathway. Gross visual field or functional visual field extent can be estimated by tests such as confrontation visual field testing, finger counting field testing, and white sphere kinetic perimetry. For threshold measurements of a child's visual fields, the Goldmann perimeter, or the more advanced computerized tests such as the Humphrey perimeter, Octopus perimeter, or frequency doubling technology perimeter can be used. Modifications can be made to certain tests to better suit the child's cognitive and physical abilities. The chapter covers different methods of visual field testing specific for the pediatric population.

The Learning Effect in Visual Field Testing of Healthy Subjects Using Frequency Doubling Technology

2002 ◽  
Vol 11 (6) ◽  
pp. 511-516 ◽  
Author(s):  
Amjad Horani ◽  
Shahar Frenkel ◽  
Claudia Yahalom ◽  
Marilyn D. Farber ◽  
Uriel Ticho ◽  
...  
Keyword(s):  
Visual Field ◽  
Healthy Subjects ◽  
Learning Effect ◽  
Frequency Doubling ◽  
Field Testing ◽  
Visual Field Testing ◽  
Frequency Doubling Technology

Low-cost, smartphone-based frequency doubling technology visual field testing using a head-mounted display

2019 ◽  
pp. bjophthalmol-2019-314031 ◽  
Author(s):  
Karam AlRahman Alawa ◽  
Ryan P Nolan ◽  
Elaine Han ◽  
Alejandro Arboleda ◽  
Heather Durkee ◽  
...  
Keyword(s):  
Visual Field ◽  
Linear Regression ◽  
Open Angle Glaucoma ◽  
Low Cost ◽  
Frequency Doubling ◽  
Regression Analyses ◽  
Field Screening ◽  
Head Mounted Display ◽  
Frequency Doubling Technology ◽  
Significant Difference

BackgroundCurrent visual field screening machines are bulky and expensive, limiting their accessibility, affordability and use. We report the design and evaluation of a novel, portable, cost-effective system for glaucoma screening using smartphone-based visual field screening using frequency doubling technology (FDT) and a head-mounted display.MethodsNineteen eyes of 10 subjects with new-onset or chronic primary open angle glaucoma were tested and compared with the Humphrey Zeiss FDT and the newly developed Mobile Virtual Perimetry (MVP) FDT with the C-20 testing pattern. Mann-Whitney, Bland-Altman and linear regression analyses were performed to assess statistical difference, agreement and correlation, respectively, between the two devices.ResultsThe average age of the participants was 58±15 years. No statistically significant difference was found between the MVP FDT and the Humphrey Zeiss FDT (p>0.05). Bland-Altman and linear regression analyses demonstrated good agreement and correlation between the two devices.ConclusionThe MVP FDT is a low-cost, portable visual field screening device that produces comparable results to the Humphrey Zeiss FDT and may be used as an easily accessible screening tool for glaucoma.

scholarly journals Alzheimer’s Disease: Screening Biomarkers Using Frequency Doubling Technology Visual Field

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Denise A. Valenti
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Visual Field ◽  
Visual System ◽  
Frequency Doubling ◽  
Field Testing ◽  
Retinal Diseases ◽  
Screening Criteria ◽  
Normative Database ◽  
Frequency Doubling Technology

This study was to investigate the feasibility of frequency doubling technology (FDT) visual field testing in Alzheimer’s disease (AD) in order to identify early biomarkers of AD in patients already diagnosed with AD and compare the findings to participants not having Alzheimer’s disease. This biomarker would be useful in a battery of tests for the early identification of those with AD. It was not the intent to correlate the visual system biomarker with severity of disease, but to determine if the biomarker was present in pass or fail screening criteria. The study showed with very strong significance that the FDT can identify biomarkers of those with AD compared to an age-matched population that does not have AD. FDT is a simple test to take and administer and has been used to screen for eye and retinal diseases such as glaucoma, retinal macular degeneration, and diabetic retinopathy. The results obtained in the FDT readout are analyzed and compared to the age normative database within the system. The FDT ability to screen for AD biomarker in the visual system was significant in those with AD compared to the controls, and the deficits were not related to any ocular pathology.

Sign in / Sign up

Export Citation Format

Share Document