对比敏感度值

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

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 (Contrast level 7) .12

* Čes. a slov. Oftal., 62, 2006, No. 6, p. 372 - 380.

Population Norms

(Younger Age Group: 20 - 55 Years of Age):

The following tables show data collected as base line (preoperative) measurements in an FDA clinical trial for refractive surgery. These results are based on the evaluation of 156 normal eyes (79 patients) with an age range of 21 - 55 years of age (36.6 yo + 9.02 years). Average preoperative acuity for these patients was 20/16 + 2.35 (number of letters: 45.07 + 3.08).

Photopic Conditions

Spatial Frequency Log Average

(Contrast Level)

Standard Deviation

Row A (3 cpd) 1.84 (6.38) .14 (0.93) Row B (6 cpd) 2.09 (6.67) .16 (1.08) Row C (12 cpd) 1.76 (6.46) .17 (1.15) Row D (18 cpd) 1.33 (6.50) .19 (1.31)

Mesopic Conditions

Spatial Frequency Log Average

(Contrast Level)

Standard Deviation

Row A (3 cpd) 1.61 (4.85) .21 (1.43)

Row B (6 cpd) 1.66 (3.77) .23 (1.50)

Row C (12 cpd) 1.08 (2.33) .32 (1.56)

Row D (18 cpd) 0.56 (1.97) .35 (1.52)

Population Norms*

(Older Age Group: 50 - 75 Years of Age):

Spatial Frequency Average Standard Deviation Row A (3 cpd) 1.56 (Contrast level 4) .15

Row B (6 cpd) 1.80 (Contrast level 5) .165