Oman Journal of Ophthalmology

ORIGINAL ARTICLE
Year
: 2012  |  Volume : 5  |  Issue : 2  |  Page : 97--102

Comparison between Humphrey Field Analyzer and Micro Perimeter 1 in normal and glaucoma subjects


Vineet Ratra, Dhanashree Ratra, Muneeswar Gupta, K Vaitheeswaran 
 Medical Research Foundation, Sankara Nethralaya, Chennai, India

Correspondence Address:
Vineet Ratra
Senior Consultant and Incharge, Navasuja Sankara Nethralaya, 73, Venkata Krishna Road, RA Puram, Chennai-600028
India

Purpose: To determine the correlation between fundus perimetry with Micro Perimeter 1 (MP1) and conventional automated static threshold perimetry using the Humphrey Field Analyzer (HFA) in healthy individuals and in subjects with glaucoma. Materials and Methods: In this study, we enrolled 45 eyes with glaucoma and 21 eyes of age-matched, healthy individuals. All subjects underwent complete ophthalmic examination. Differential light sensitivity was measured at 21 corresponding points in a rectangular test grid in both MP1 and HFA. Similar examination settings were used with Goldmann III stimulus, stimulus presentation time of 200 ms, and white background illumination (1.27 cd/m 2 ). Statistical analysis was done with the SPSS 14 using linear regression and independent t-test. Results: The mean light thresholds of 21 matching points in control group with MP1 and HFA were 14.97 ± 2.64 dB and 30.90 ± 2.08 dB, respectively. In subjects with glaucoma, the mean values were MP1: 11.73 ± 4.36 dB and HFA: 27.96 ± 5.41 dB. Mean difference of light thresholds among the two instruments was 15.86 ± 3.25 dB in normal subjects (P < 0.001) and 16.22 ± 2.77 dB in glaucoma subjects (P < 0.001). Pearson correlation analysis of the HFA and MP1 results for each test point location in both cases and control subjects showed significant positive correlation (controls, r = 0.439, P = 0.047; glaucoma subjects, r = 0.812, P < 0.001). There was no difference between nasal and temporal points but a slight vertical asymmetry was observed with MP1. Conclusion: There are significant and reproducible differences in the differential light threshold in MP1 and HFA in both normal and glaucoma subjects. We found a correction factor of 17.271 for comparison of MP1 with HFA. MP1 appeared to be more sensitive in predicting loss in glaucoma.


How to cite this article:
Ratra V, Ratra D, Gupta M, Vaitheeswaran K. Comparison between Humphrey Field Analyzer and Micro Perimeter 1 in normal and glaucoma subjects.Oman J Ophthalmol 2012;5:97-102


How to cite this URL:
Ratra V, Ratra D, Gupta M, Vaitheeswaran K. Comparison between Humphrey Field Analyzer and Micro Perimeter 1 in normal and glaucoma subjects. Oman J Ophthalmol [serial online] 2012 [cited 2022 Dec 8 ];5:97-102
Available from: https://www.ojoonline.org/article.asp?issn=0974-620X;year=2012;volume=5;issue=2;spage=97;epage=102;aulast=Ratra;type=0