Khảo sát sự biến đổi một số chỉ số điện thế kích thích thị giác trên trẻ nhược thị

To measure and compare visual evoked potential (VEP) response of amblyopic eyes with VEP responses of sound eyes in amblyopic children. A study of 37 amblyopic children aged 4 to 13 with pattern-reversal VEPs elicited by checkerboard stimuli with medium checks. The children were classified into two groups: Group I, 23 male children; Group II, 14 female children. Visual acuity (VA) was significantly worse in the amblyopic eye as compared to the sound eye. No statistically significant differencewas found between male and female groups. Results of VEP responses' characteristic analysis indicated that: The latency of N75. P100, N145 in male and female children group respectively were (74,82 + or - 5,10 ms, 72,66 + or - 8,14 ms); (111,60 + or - 10,31 ms, 110,62 + or - 10,28 ms); (146,42 + or - 10,25 ms, 152,07 + or - 10,63 ms). Amplitude of N75, P100; N145 were (2,53 + or - 2,03 pV, 2,34 + or - 1,76 pV); (10,55 + or - 5,07 pV, 10,20 + or - 4,72 pV); (9,00 + or - 5,88 pV, 8,87 + or - 4,82 pV in response). Frequency of occurrence of P100, N75 is 100 percent. Prolonged latency and reduced amplitude of P100 in amblyotic eye.