对比敏感度值.docVIP

CONTRAST SENSITIVITY CSV-1000 NORMS CONTRAST VALUES FOR THE CSV-1000E:The following tables show the contrast sensitivity scores for the CSV-1OOOE for both linear and log values. For statistical analysis, use of the log values is recommended. Contrast Sensitivity Values for the CSV-1OOOE: ? S 1 2 3 4 5 6 7 8 Row CPD A 3.0 0.1 5 10 15 22 31 43 61 85 120 B 6.0 0.2 8 16 24 36 50 70 99 138 193 C 12.0 0.4 4 8 12 18 25 35 50 70 99 D 18.0 0.6 1.5 3 4.5 7 9.5 13 18 25 36 Contrast Sensitivity Values for the CSV-1OOOE in Log Units: ? S 1 2 3 4 5 6 7 8 Row CPD A 3.0 .70 1 1.17 1.34 1.49 1.63 1.78 1.93 2.08 B 6.0 .91 1.21 1.38 1.55 1.70 1.84 1.99 2.14 2.29 C 12.0 .61 .91 1.08 1.25 1.40 1.54 1.69 1.84 1.99 D 18.0 .17 .47 .64 .81 .96 1.10 1.25 1.4 1.55 No zero value exists on a logarithmic scale. For research purposes, do not enter a zero in your data if the patient cannot see the first grating sample grating . To obtain a log value if no gratings are visible, subtract .3 log from the lowest score on the row i.e. Row A .4, Row B .61, Row C .31 and Row D -.13 . Population Norms Children Age Group: 6 - 10 and 11 - 19 Years of Age : The table below provides population normal values for children between the ages of 6 to 10 years old and 11 to 19 years old. This data was collected as part of a larger study in which Prof J. Krasny and colleagues from the Department of Ophthalmology, University Hospital in the Czech Republic studied the usefulness of the CSV-1000 to detect early ocular changes in children.* Ages 6 to 10 Spatial Frequency Average Standard Deviation Row A 3 cpd 1.82 Contrast level 6 .13 Row B 6 cpd 2.04 Contrast level 6 .14 Row C 12 cpd 1.74 Contrast level 6 .11 Row D 18 cpd 1.29 Contrast level 6 .11 Ages 11 to 19 Spatial Frequency Average Standard Deviation Row A 3 cpd 1.92 Contrast level 6 .09 Row B 6 cpd 2.19 Contrast level 7 .12 Row C 12 cpd 1.89 Contrast level 7 .10 Row D 18 cpd 1.42 Co