Katsumi O, Denno S, Arai M, De Lopes Faria J, Hirose T
Schepens Eye Research Institute, Boston, MA 02114, USA.
Graefes Arch Clin Exp Ophthalmol. 1997 Nov;235(11):684-90. doi: 10.1007/BF01880666.
We compared the visual acuities obtained with preferential looking (PL), the most widely used method of pediatric vision assessment, with those obtained with the spatial frequency sweep pattern-reversal visual evoked response (SPVER).
Eighty patients (ages 1.5 months to 12 years) with various ocular pathologies participated in this study. The PL acuity was determined using the up-and-down staircase procedure. The PVER was recorded with the spatial frequency sweep method using 10 spatial frequencies; the acuity was determined by placing the best-fit regression line on the descending slope of the PVER amplitude-spatial frequency function toward the higher spatial frequency to the baseline.
The PL acuities ranged from 20/25 to < 20/1600 (mean 20/155). The correlation between the two methods was good (r = 0.847). Fifty-six patients (70%) had an acuity agreement within 1.0 octave. When the PL acuity was > 20/128, it was on average better than the PVER acuity. When the PL acuity was lower, the PVER acuity was usually better. This tendency was marked when the visual acuities were very poor (y = 0.552x + 0.362).
The methods correlate well, although there is a dissociation of acuities in the presence of very low vision. PVER may be a useful addition to PL in assessment of vision in infants and young children.
我们比较了使用小儿视力评估中最常用的优先注视法（PL）所获得的视力与使用空间频率扫频模式翻转视觉诱发电位（SPVER）所获得的视力。
80例患有各种眼部疾病的患者（年龄1.5个月至12岁）参与了本研究。使用上下阶梯法确定PL视力。使用空间频率扫频法记录10个空间频率的PVER；通过将最佳拟合回归线置于PVER振幅-空间频率函数朝向更高空间频率的下降斜率上至基线来确定视力。
PL视力范围为20/25至<20/1600（平均20/155）。两种方法之间的相关性良好（r = 0.847）。56例患者（70%）的视力一致性在1.0倍频程内。当PL视力>20/128时，其平均优于PVER视力。当PL视力较低时，PVER视力通常更好。当视力非常差时，这种趋势很明显（y = 0.552x + 0.362）。
尽管在视力极低的情况下视力存在分离，但两种方法相关性良好。在评估婴幼儿视力时，PVER可能是PL的有益补充。
