Duration 5min, Q&A 3min
Development of the New Visual Field Screening Software and Evaluation of its Efficiency in Glaucoma Screening: A Pilot Study
Glaucoma is the leading cause of irreversible blindness. Most of the patients are asymptomatic until the advance stage. Early detection can prevent glaucoma progression and visual deterioration. However, screening tools for glaucoma are still limited because of limitation in both ophthalmologists and instruments, especially in developing countries. Therefore, the aim of this study was to develop a new visual field (VF) screening software for personal computer that can be easily accessed by everyone and evaluated its efficiency by comparing with the standard automated perimetry (SAP) in terms of reliability and validity. We also compared participants' comfort, satisfaction, and ease of use between the new VF screening software and SAP.
The new VF screening software was developed to test VF in 24 degrees from fixation. Five glaucoma patients that had glaucomatous optic neuropathy and correlated visual field abnormalities and 5 healthy participants were enrolled. Glaucoma patients had at least 3 repeatable SAP results and all participants performed SAP within 3 months before included in the study.
All participants were randomly selected one eye to perform the VF test by the new software three times (one-hour apart). After finishing all the tests, the subjects completed the visual analog scale questionnaire about their satisfaction and ease of use of the new software compared with SAP. The VF results were interpreted by glaucoma specialist. Statistical analysis was done by SPSS software version 20 using non-weighted kappa coefficient for measuring of validity and reliability of the new VF screening software. Patients' satisfaction were analyzed using paired t-test for normal distributed data and Wilcoxon signed rank test for non-normal distribution.
Results and Conclusion
The average (SD) age was 59.84 (7.44) and 44.6 (6.39) years in glaucoma and healthy subjects. Average kappa between each test of the new VF screening software was 0.86, range; 0.78-1.00 (p=0.002-0.011). The agreement between the new software and SAP was 0.6 (p=0.038). The average (SD) test duration was 139.11 (1.03) and 312.22 (59.84) seconds for the new software and SAP, respectively (p<0.001). The new VF screening software got significantly better patients' satisfaction in the whole group in all categories including comfort, satisfaction and ease of use (p<0.05), except a question about the ability to concentrate during test (p=0.115). In conclusion, the new VF screening software showed excellent reliability and good agreement with SAP to detect glaucomatous visual field defect with shorter test duration and improvement of patients' satisfaction.
[ Keyword ]
glaucoma / visual field / software / screening / perimetry
[ Conflict of Interest ]