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A PRESENTATION FROM RIO-GOH CHENNAI

A COMPARATIVE ANALYSIS OF VARIOUS AUTOMATED PERIMETERS. Author: Prof. Dr. V. VelayuthamCo-Authors: Dr. D. Ranjit PrabhuDr. Nirmal FredrickDr. Suma Elangovan. AIM. Comparison of visual field plotting in glaucoma patients with Octopus Interzeag 1-2-3, Humphrey Field Analyzer II and Frequency Do

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A PRESENTATION FROM RIO-GOH CHENNAI

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    2. A COMPARATIVE ANALYSIS OF VARIOUS AUTOMATED PERIMETERS Author: Prof. Dr. V. Velayutham Co-Authors: Dr. D. Ranjit Prabhu Dr. Nirmal Fredrick Dr. Suma Elangovan

    3. AIM Comparison of visual field plotting in glaucoma patients with Octopus Interzeag 1-2-3, Humphrey Field Analyzer II and Frequency Doubling Perimetry.

    4. Design Prospective, Comparative study Participants: 100 eyes of 50 patients who attended glaucoma clinic in RIO-GOH during Jan 2005 and March 2006. All patients were randomly selected

    5. Inclusion Criteria Primary open angle glaucoma, Normo-tensive glaucoma and Glaucoma suspect Best corrected visual acuity 6/12 or better Gonio – open angle ( >2 by Shaffer’s Grading) Patients co-operative for visual field analysis

    6. Exclusion Criteria Closed angles by gonioscopy Secondary and Congenital glaucoma Ocular diseases showing similar visual field defects Patients with media opacities - corneal edema / opacity, lens changes and retinal pathology Patients who underwent intraocular surgeries or laser treatment

    7. Patient Evaluation Slit Lamp Examination Measurement of Intraocular pressure Slit Lamp Biomicroscopy – Fundus Gonioscopy – Angle Grading

    8. Visual Field Examinations Octopus Interzeag 1-2-3 TOP Humphrey Field Analyzer II, central 30-2 threshold test (SITA standard) Frequency Doubling Technology – Full threshold (C-20) All tests were carried out within a period of one week by trained personnel.

    9. Parameters Analysed Mean Deviation / Mean Defect and Pattern Standard deviation / Loss variance of both eyes were compared and correlated between these perimeters using the Pearson correlation and Scatter diagram with regression estimate Linear regression analysis was used to calculate the correlation coefficients. Statistical comparison between groups used unpaired 2-tailed-t-test. The average time taken to perform each test was analysed

    10. Correlation of Mean Deviation / Defects between the perimeters

    11. Correlation of Pattern Standard Deviation / Loss Variance between the perimeters

    12. Time Duration taken to perform the test

    13. Discussion Octopus Mean Defects negatively correlates with Humphrey and FDT Humphrey Mean Deviation positively correlates with FDT P < 0.001 – statistically significant Octopus Loss Variance positively correlates with PSD of Humphrey and FDT Humphrey PSD positively correlates with FDT RE p < 0.05 & LE p < 0.001 --- correlation statistically significant Test duration least in Octopus

    14. Summarizing Visual field plotting with Octopus (TOP) is shortest Global indices arrived at field plotting with all three perimeters are comparable

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