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Population Values for VectorVision Contrast Sensitivity

This page shows the linear and log contrast sensitivity values for the contrast levels used on the VectorVision  standardized contrast sensitivity tests (CSV-1000 and CSV-2000). Shown lower on the page are the population normal values for the VectorVision tests for a variety of age groups. Normal values for mesopic contrast sensitivity are also provided.

 

Contrast Sensitivity Values For VectorVision Test

The following tables show the contrast sensitivity values for both linear and log format. For statistical analysis, use of the log values is recommended.

 

Contrast Sensitivity Values

  S 1 2 3 4 5 6 7 8

Row (CPD)

A (3.0)

5

10 15 22 31 43 61 85 120
B (6.0)

8

16

24 36 50 70 99 138

193

C (12.0)

4

8

12 18 25 35 50 70

99

D (18.0) 1.5 3 4.5 7 9.5 13 18 25

36

 

Contrast Sensitivity Values 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 rows A, B and C. (i.e. Row A .4, Row B .61, Row C .31). For Row D, use .01 log, or essentially 100% contrast.

 

Normal Contrast Sensitivity Population Values

Population Norms for Younger Age Groups
(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 VectorVision contrast sensitivity test 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 (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

Row C (12 cpd)

1.50 (Contrast level 5)

.15

Row D (18 cpd)

.93 (Contrast level 4)

.25

*Pomerance G, Evans D. Test-Retest Reliability of the CSV-1000 Contrast Test and Its Relationship to Glaucoma Therapy. Invest Ophthalmol Vis Sci. 1994. 35(9); 3357-3361.

 

Test for 1.5 cycles/degree for evaluation of mesopic contrast sensitivity or low vision

The CSV-1000-1.5cpd is a special test face designed for FDA clinical trials and for low vision assessment. The following provides the answer key for this test face and the contrast values in log units.

 

Answer Key

S 1 2 3 4 5 6 7 8
 

B

A A B B B A

B

 

Contrast Sensitivity Values for the CSV-1000-1.5cpd in Log Units

S 1 2 3 4 5 6 7 8

.60

.90 1.07 1.22 1.37 1.52 1.67 1.82

1.97

 

The CSV-1000-1.5cpd has been adopted for the FDA clinical trials to evaluate mesopic contrast sensitivity testing and mesopic glare sensitivity testing for refractive surgery and certain intraocular lenses (IOLs). If there are any questions concerning the use of the CSV-1000 instrument for mesopic contrast or glare testing, please contact us.

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CSV-2000

CSV-2000 The first and only all-in-one digital vision testing device that offers the full range of vision tests, along with STANDARDIZED contrast sensitivity, glare and visual acuity.

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AcQviz Auto-Calibration

Includes the patented AcQviz technology that automatically measures monitor luminance and adjusts testing to the recognized FDA vision testing luminance standard of 85 cd/m2.


  • Standardized to the testing light level recommended by the FDA and ANSI

  • Easy-to-use remote control allows rapid integration into patient flow

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Full Range of Vision Tests

Includes the full range of vision tests, including acuity, astigmatism, convergence, color, depth, etc. and the proprietary VectorVision contrast sensitivity and glare tests.


  • Standardized to the testing light level recommended by the FDA and ANSI

  • Easy-to-use remote control allows rapid integration into patient flow

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Scientifically Validated Contrast Sensitivity Testing

Uses the same contrast and spatial frequency range that is validated by more than 100 scientific papers and provides the only published population age-norms.


  • Standardized to the testing light level recommended by the FDA and ANSI

  • Easy-to-use remote control allows rapid integration into patient flow

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Rapid Testing

Remote control provides the ability to easily switch between tests. All tests are designed specifically for a computerized format, thus making testing fast and easy.


  • Standardized to the testing light level recommended by the FDA and ANSI

  • Easy-to-use remote control allows rapid integration into patient flow

Why VectorVision?


As treatments evolve, so must the testing technology

Over the last 20 years, VectorVision testing equipment has become the worldwide benchmark for standardized contrast sensitivity, glare and ETDRS acuity testing.

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