Head Mounted Eye Tracking Aide for Loss of Central Vision (HETALCEV)
| Status: | Recruiting |
|---|---|
| Conditions: | Ocular |
| Therapuetic Areas: | Ophthalmology |
| Healthy: | No |
| Age Range: | 18 - Any |
| Updated: | 1/26/2019 |
| Start Date: | April 2016 |
| End Date: | May 2024 |
| Contact: | Wendy Elasky, BS, CCRP |
| Email: | waelasky@umn.edu |
| Phone: | 612-626-3056 |
Head Mounted Eye Tracking Aide for Loss of Central Vision
A device has been developed that has eye trackers integrated within the Head Mounted Display
(HMD) and can remap text and images around the scotoma in real time to prevent information
loss from a central scotoma. It can also carry out other types of image processing such as
contrast enhancement and image magnification. The aim of this study is to assess the efficacy
of this device on the visual performance of participants suffering from central vision loss,
with and without remapping
(HMD) and can remap text and images around the scotoma in real time to prevent information
loss from a central scotoma. It can also carry out other types of image processing such as
contrast enhancement and image magnification. The aim of this study is to assess the efficacy
of this device on the visual performance of participants suffering from central vision loss,
with and without remapping
Participants with bilateral central scotomas will be selected for this study during their
routine clinical visits at the University of Minnesota Eye Clinic. Written consent will be
obtained from all participants.
Each participant will have their scotomas mapped using a Nidek MP-1 microperimeter housed in
the psychology department to give exact size and shape information. This allows for the
extent of each eye's scotoma to be put into the remapping software, and their intersection
used in remapping calculation. Comparisons will be made between participants with small
scotoma, less than 5 degrees, and participants with large scotoma, larger than 5 degrees.
Experiments to be performed with the device are also divided into two categories. Category 1
involves reading of naturalistic text, and everyday task performance. Category 2 involves
studying the effects of practice with the device on performance in category 1 experiments.
Participants will schedule an initial one-hour session for testing. During testing,
participants will be told about the device and its functionality. Main instructions include
what patients can expect to experience and see when wearing the HMD. Following this, the
participants will be instructed on how to wear the HMD. If they have any glasses/ corrective
lenses, they can be kept on. Once the patients don the HMD, testing will begin.
Initially, a calibration-free mode will be tested. This will entail asking the subject to
focus on a particular point on the screen and checking if the gaze point determined by the
eye tracker corresponds to this point. If good calibration is obtained, the investigators
proceed with testing. Otherwise, a 3-point calibration sequence will be initiated following
instructions on the software program. For the 3-point calibration sequence, the participant
will be instructed to fixate at 3-5 different points on the screen one at a time. Following
this calibration sequence, testing will resume and visual performance such as reading speed
in words/minute will be measured as the primary outcome measure, with and without remapping.
routine clinical visits at the University of Minnesota Eye Clinic. Written consent will be
obtained from all participants.
Each participant will have their scotomas mapped using a Nidek MP-1 microperimeter housed in
the psychology department to give exact size and shape information. This allows for the
extent of each eye's scotoma to be put into the remapping software, and their intersection
used in remapping calculation. Comparisons will be made between participants with small
scotoma, less than 5 degrees, and participants with large scotoma, larger than 5 degrees.
Experiments to be performed with the device are also divided into two categories. Category 1
involves reading of naturalistic text, and everyday task performance. Category 2 involves
studying the effects of practice with the device on performance in category 1 experiments.
Participants will schedule an initial one-hour session for testing. During testing,
participants will be told about the device and its functionality. Main instructions include
what patients can expect to experience and see when wearing the HMD. Following this, the
participants will be instructed on how to wear the HMD. If they have any glasses/ corrective
lenses, they can be kept on. Once the patients don the HMD, testing will begin.
Initially, a calibration-free mode will be tested. This will entail asking the subject to
focus on a particular point on the screen and checking if the gaze point determined by the
eye tracker corresponds to this point. If good calibration is obtained, the investigators
proceed with testing. Otherwise, a 3-point calibration sequence will be initiated following
instructions on the software program. For the 3-point calibration sequence, the participant
will be instructed to fixate at 3-5 different points on the screen one at a time. Following
this calibration sequence, testing will resume and visual performance such as reading speed
in words/minute will be measured as the primary outcome measure, with and without remapping.
Inclusion Criteria:
- 18 years or older
- Central vision loss from bilateral central scotomas
- No cognitive impairment as indicated by a Mini-Mental State Examination (MMSE)
Exclusion Criteria:
- Failed MMSE
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