Matching Items (2)
Description
To address the need for a patient decision aid for refractive eye surgery, EyeChoose, a web-based tool, was developed. The tool provides patient education, assists in selection of a specific surgical modality, generates customized recommendations, and links patients to local surgeons, explicitly targeting the population of college students. I conducted a focus group interview for the needs assessment. I designed a scoring algorithm to provide a customized recommendation of surgical modalities based on a patient’s medical history and personal preferences. I completed a prototype implementation of the tool. Initial data from a validation study indicated that the system achieved 99.18% accuracy in its recommendation of a surgical modality. An evaluation of usefulness and usability, conducted via survey and focus group, also illustrated highly positive responses. Fourteen of sixteen statements in the survey received more than 80% of positive responses. I further examined the two statements that received less than 80% of positive responses to determine whether the responses varied by race, ethnicity, sex, and medical history. The focus group liked the application and found it useful for their needs. Their responses clarified features of the application that users liked/found beneficial and features that users did not like/did not find beneficial. These recommendations will be integrated into the tool as the next step. Future research is required to implement the tool in naturalistic settings and to examine the generalizability of the findings to other populations.
ContributorsSubbaraman, Bhavani (Author) / Wang, Dongwen (Thesis director) / Patel, Vimla (Committee member) / Essary, Alison (Committee member) / Barrett, The Honors College (Contributor) / School of Life Sciences (Contributor) / College of Health Solutions (Contributor) / Department of Information Systems (Contributor)
Created2022-05
Description
During attempted fixation, the eyes are not still but continue to produce so called "fixational eye movements", which include microsaccades, drift, and tremor. Microsaccades are thought to help prevent and restore vision loss during fixation, and to correct fixation errors, but how they contribute to these functions remains a matter of debate. This dissertation presents the results of four experiments conducted to address current controversies concerning the role of microsaccades in visibility and oculomotor control.
The first two experiments set out to correlate microsaccade production with the visibility of foveal and peripheral targets of varied spatial frequencies, during attempted fixation. The results indicate that microsaccades restore the visibility of both peripheral targets and targets presented entirely within the fovea, as a function of their spatial frequency characteristics.
The last two experiments set out to determine the role of microsaccades and drifts on the correction of gaze-position errors due to blinks in human and non-human primates, and to characterize microsaccades forming square-wave jerks (SWJs) in non-human primates. The results showed that microsaccades, but not drifts, correct gaze-position errors due to blinks, and that SWJ production and dynamic properties are equivalent in human and non-human primates.
These combined findings suggest that microsaccades, like saccades, serve multiple and non-exclusive functional roles in vision and oculomotor control, as opposed to having a single specialized function.
The first two experiments set out to correlate microsaccade production with the visibility of foveal and peripheral targets of varied spatial frequencies, during attempted fixation. The results indicate that microsaccades restore the visibility of both peripheral targets and targets presented entirely within the fovea, as a function of their spatial frequency characteristics.
The last two experiments set out to determine the role of microsaccades and drifts on the correction of gaze-position errors due to blinks in human and non-human primates, and to characterize microsaccades forming square-wave jerks (SWJs) in non-human primates. The results showed that microsaccades, but not drifts, correct gaze-position errors due to blinks, and that SWJ production and dynamic properties are equivalent in human and non-human primates.
These combined findings suggest that microsaccades, like saccades, serve multiple and non-exclusive functional roles in vision and oculomotor control, as opposed to having a single specialized function.
ContributorsCostela, Francisco M (Author) / Crook, Sharon M (Committee member) / Martinez-Conde, Susana (Committee member) / Macknik, Stephen L. (Committee member) / Baer, Stephen (Committee member) / McCamy, Michael B (Committee member) / Arizona State University (Publisher)
Created2014