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KMID : 1159320220240010001
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Korean Journal of Vision Science
2022 Volume.24 No. 1 p.1 ~ p.11
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Event-Related Potential (ERP) Changes in the Visual Cortex Wearing Multifocal Contact Lense
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Jung Su-Min
Lee Koon-Ja
Lee Seung-Hwan
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Abstract
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Purpose : To understand the event-related potential (ERP) changes in the visual cortex with eyes wearing multifocal contact lens (MFCL).
Methods : Twenty myopes (15 females, 5 males, 24.00±0.51 years) who had no history of ocular disease participated. The exclusion criteria were monocular corrected visual acuity worse than 0.00 logMAR, astigmatism >-0.75 D, anisometropia >0.50 D, abnormal accommodative amplitude, or any history of refractive surgery. After wearing SVCL and low-add MFCL, visual responses occurring in the visual cortex were recorded as ERPs using NeuroScan SynAmps 2 program. The P100 was analyzed for initial visual responses using O1 and O2 channels, and N170 was obtained for visual recognition using P7, PO7, P8 and PO8 channels. The amplitude and latency of P100 and N170 when wearing MFCL were compared with those of SVCL wearing.
Results : When wearing MFCL, the P100 amplitudes showed no difference compared with wearing SVCL under monocular and binocular viewing conditions, however, the latency of P100 was longer in the dominant eye than wearing SVCL (p=0.036). The N170 amplitudes in the dominant and the non-dominant eye wearing MFCL were significantly smaller than those with SVCL wearing (p=0.001, p=0.008, respectively), and the N170 latencies in the dominant and the non-dominant eye wearing MFCL were not different from wearing SVCL. Under binocular condition, the N170 amplitude and latency were not different from wearing SVCL (p=0.200, p=0.249, respectively).
Conclusion : When wearing MFCL monocularly, the initial visual response and recognition response were lower than wearing SVCL, but there was no difference binocularly. Therefore, it is considered that the ghost images that appears when wearing MFCL would be overcome through binocular fusion, and would not affect binocular visual performance.
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KEYWORD
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ERPs, Multifocal Contact Lenses, N170, P100, Visual perception
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