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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Choudhari, Nikhil S. Mandal, Anil K. Garudadri, Chandra S. Rao, Harsha L. Senthil, Sirisha |
| Description | Country affiliation: India Author Affiliation: Rao HL ( VST Glaucoma Centre, L V Prasad Eye Institute, Banjara Hills, Hyderabad, India. harsha@lvpei.org) |
| Abstract | PURPOSE: To evaluate the magnitude of Visual Field Index (VFI) change attributable to change in the estimation algorithm from the pattern deviation probability plot (PDPP) to the total deviation probability plot (TDPP) when the mean deviation (MD) crosses -20 decibels (dB). METHODS: In a retrospective study, 37 stable glaucoma eyes in which MD of the VFs crossed -20 dB were identified. For each eye, a pair of VFs was selected so that one VF of the pair had a MD better than but close to -20 dB and the other had a MD worse than but again close to -20 dB. The change in VFI in the VF pairs and its associations with the number of points in probability plots with normal threshold sensitivities were evaluated. Similar pairs of VFs from 28 stable glaucoma eyes where the MD crossed -10 dB were chosen as controls. RESULTS: The change in VFI in VF pairs when the MD crossed 20 dB ranged from 3% to 33% (median: 15%), while the change when MD crossed -10 dB ranged from 1% to 8% (median: 4%). Difference in the number of points with normal threshold sensitivities in PDPP when MD was better than -20 dB compared to those in TDPP when MD crossed -20 dB significantly influenced the VFI change (R(2) = 0.65). Considering the eccentricity of these points further explained the VFI change (R(2) = 0.81). CONCLUSIONS: The decrease in VFI when MD crosses -20 dB can be highly variable. This has to be considered with the use of VFI in clinical and research settings. |
| ISSN | 01460404 |
| e-ISSN | 15525783 |
| Journal | Investigative Opthalmology & Visual Science |
| Issue Number | 1 |
| Volume Number | 54 |
| Language | English |
| Publisher | Association for Research in Vision and Ophthalmology |
| Publisher Date | 2013-01-14 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Glaucoma Physiopathology Visual Fields Physiology Disease Progression Diagnosis Intraocular Pressure Probability Retrospective Studies Visual Acuity Visual Field Tests Comparative Study Discipline Ophthalmology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ophthalmology Sensory Systems Cellular and Molecular Neuroscience |
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