Novel Portable Diagnostic Device for Automatic Detection of Relative Afferent Pupillary Defect

November 2, 2016 updated by: Amirhossein Vejdani, MD, Mashhad University of Medical Sciences

New Automatic Portable Ophthalmology Device

This study is to evaluate the ability of a newly designed device, Optic Nerve Glass (O-Glass) to detect relative afferent pupillary defect (RAPD). In this prospective study, 44 patients (diagnosed RAPD- positive) enrolled the study. They were examined for an RAPD by O-Glass and also manual swinging flashlight method (SFM) . This newly designed instrument captures and records eye pictures. The images will be processed and analyzed using computerized software to calculate pupillary measurements.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Pupil response to light stimulation is a basic clinical approach to the assessment of a patient with visual loss. Asymmetric response may indicate a relative afferent pupillary defect (RAPD). The rapid detection device for relative afferent pupillary defect (present device) is a newly designed portable facility with computerized software on a mobile device. This allows for field ophthalmic examination and identification of RAPDs quickly and accurately and also record pupillary movements for further processing and analysis or send the information and images via Wi-Fi. We aimed at comparing and evaluating this device with available methods to develop a test which is practically easy and quick with objective results and no need for specialist interpretation, so that any technician can perform the test automatically. Distinctive software allows simple use of the device by field personnel with minimal training. Each patient was investigated by swinging flashlight method and the newly constructed automated O-glass. The swinging flashlight test procedure, also called as Marcus Gunn Test, is well known in ophthalmology science.The hardware for this device includes 4 different parts: Camera and optics, light control system, power control system, and the microcontroller.The two main components of the software are the ability to communicate with the hardware wirelessly, and the pattern recognition system.

Study Type

Interventional

Enrollment (Actual)

44

Phase

  • Not Applicable

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 53 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • positive relative afferent pupillary defect

Exclusion Criteria:

-

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Diagnostic
  • Allocation: Non-Randomized
  • Interventional Model: Single Group Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: O-Glass
All study participants who were diagnosed Relative Afferent Pupillary defect(RAPD) positive according to expert specialist investigations, were enrolled in this study. They were all examined with new device named O-Glass.
Device: O-Glass
The new diagnostic device to distinguish relative afferent pupillary defect(RAPD).
Active Comparator: Swinging Flash light Test
All study participants who were diagnosed Relative Afferent Pupillary defect(RAPD) positive according to expert specialist investigations were also examined with manual diagnostic method, Swinging Flash light Test(SFT). The standard and most common method for Marcus-Gunn test is Swinging Flashlight Test (SFT), which needs a dark room, and the patient will be asked to look toward a distant object, so the pupils are not focused. The patient is asked to gaze into the distance, and the examiner swings the beam of a penlight back and forth from one pupil to the other, and observes the size of pupils and reaction in the eye that is lit.
Other: Swinging Flashlight Test
The swinging-flashlight test is used to help a practitioner identify a relative afferent pupillary defect.For an adequate test, vision must not be entirely lost. In dim room light, the examiner notes the size of the pupils. The patient is asked to gaze into the distance, and the examiner swings the beam of a penlight back and forth from one pupil to the other, and observes the size of pupils and reaction in the eye that is lit.
Other Names:
  • Other diagnostic method

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Number of Participants With Detected Relative Afferent Pupillary Defect (RAPD)
Time Frame: up to 6 months

The instrument illuminated the eyes alternatively and took images and recorded pupillary reflex to this light stimulation.

All of 44 patients were examined with two methods, SFT and O Glass. SFT method: The well known manual method to diagnose RAPD. O glass method:The device consists of camera and light sources.The red light was on and off for a 5 second interval. Then the white light was on for right eye and 3 seconds later the system captured an image. After 0.5 second the right light was off and the left light turned on, 3 seconds later the image was captured. The images were processed and analyzed using computerized software.
up to 6 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Mashhad University of Medical Sciences

Investigators

  • Study Chair: Amirhossein Vejdani, M.D., Mashhad University Of Medical Sciences

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

December 1, 2015

Primary Completion (Actual)

May 1, 2016

Study Completion (Actual)

June 1, 2016

Study Registration Dates

First Submitted

May 10, 2016

First Submitted That Met QC Criteria

May 12, 2016

First Posted (Estimate)

May 13, 2016

Study Record Updates

Last Update Posted (Estimate)

December 29, 2016

Last Update Submitted That Met QC Criteria

November 2, 2016

Last Verified

November 1, 2016

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • IR.MUMS.REC.1395.15

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Undecided

IPD Plan Description

I have not decided about it.

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Multiple Sclerosis

Clinical Trials on O-Glass

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Bahamas

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

3
Subscribe