| ORIGINAL ARTICLE |
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| Year : 2012 | Volume
: 60
| Issue : 1 | Page : 49-52 |
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Multifocal electroretinogram in normal emmetropic subjects: Correlation with optical coherence tomography
Rajvardhan Azad, Urmimala Ghatak, Yog Raj Sharma, Parijat Chandra
Dr. R. P. Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
Correspondence Address:
Urmimala Ghatak
Room No. 487, Dr. R. P. Centre for Ophthalmic Sciences, New Delhi-110 001
India
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/0301-4738.91345
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Aim of the Study: To establish the normative database for multifocal electroretinogram (mfERG) parameters in a normal emmetropic population. To correlate the data so obtained with the central macular thickness obtained using the optical coherence tomography (OCT) scan. Materials and Methods: mfERG data were obtained from 222 eyes of 111 emmetropic subjects. The amplitude (nv/deg 2 ) and implicit times (ms) of the first-order kernel mfERG responses (N1, P1, and N2 waves) were obtained and grouped into five rings (Ring 1: Central 2°, Ring 2: 2-5°, Ring 3: 5-10°, Ring 4: 10-15°, Ring 5: >15°). The central macular thickness (CMT) was obtained using the macular thickness scan protocol of the OCT. Results: The mfERG data obtained were used to create a normative database. The amplitudes of the mfERG waves were maximum in the fovea and progressively decreased with increasing eccentricity (P = 0.0001). The latencies of the P1 and N2 waves were longest in the central ring and progressively shortened with eccentricity (P = 0.0001). No statistically significant correlations were observed between central ring 1 parameters and the CMT. Conclusion: This study establishes normative database for mfERG parameters in an emmetropic population. No statistically significant correlation was noted between CMT and mfERG parameters. |
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