CONTRAST SENSITIVITY IN 24-MONTH-OLDS AND 36-MONTH-OLDS AS ASSESSED WITH THE CONTRAST SENSITIVITY CARD PROCEDURE

被引：12

作者：

ADAMS, RJ ^{[1
]}

COURAGE, ML ^{[1
]}

机构：

[1] ST CLARES MERCY HOSP,ST JOHNS,NF,CANADA

来源：

OPTOMETRY AND VISION SCIENCE | 1993年 / 70卷 / 02期

关键词：

CONTRAST SENSITIVITY; VISUAL DEVELOPMENT; SPATIAL VISION; INFANTS; CHILDREN;

D O I：

10.1097/00006324-199302000-00002

中图分类号：

R77 [眼科学];

学科分类号：

100212 ;

摘要：

We used a new card procedure to evaluate binocular contrast sensitivity (CS) in 24- and 36-month-old children. The test consists of 40 large (50 by 28 cm) matteboard cards, each of which contains a sine wave grating with 1 of 5 spatial frequencies (0.4, 0.8, 1.6, 3.2, and 4.8 cpd at 80 cm) and with 1 of 8 contrast levels [from 33% (CS = 3) to 0.4% (CS = 260)]. Estimates of subjects' CS to each spatial frequency were obtained with a modified forced-choice preferential looking (FPL) technique similar to that developed for the Teller Acuity Cards (TAC). All 36-month-olds and 74% of the 24-month-olds completed the entire procedure in an average of 12 min per child. For both groups, the shape of the mean constrast sensitivity functions (CSF's) resembled the characteristic inverted U shown by normal adults, except that the toddlers' functions were shifted to lower contrasts and spatial frequencies. Combined with previous results, it appears that the CS cards hold promise as a time-efficient means of assessing CS in infants and young children, and may provide the prototype for a clinical tool to help detect early visual and neurological dysfunction.

引用

页码：97 / 101

页数：5

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