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Mesopic Testing

Mesopic Contrast Sensitivity Testing

The CSV-2000 and CSV-1000 can be easily used for testing mesopic contrast sensitivity and glare. The instruments automatically maintain a consistent and uniform testing light level through proprietary auto-calibration technology that monitors and adjusts the test lighting. For photopic testing, the unit calibrates test lighting to 85 cd/m2. When mesopic filters are used, as described below, the testing light level is held constant at 3 cd/m2, which is the mesopic light level recommended by the FDA to simulate night driving conditions in clinical trials. Also, the Clinical Trial Suite (CTS) version of the CSV-2000 offers a second set of contrast sensitivity gratings that provide higher contrast levels for testing patients in mesopic conditions, if needed.

 

Mesopic Filters Available in Different Formats

The mesopic filters are available as trial lenses, which can be placed in the phoropter or in trial frames, alternatively, the lenses can be purchased in their own frame. See images below.

 

Mesopic filters

 

Data for Mesopic Testing

Many studies have been performed with the VectorVision testing devices to evaluate mesopic contrast sensitivity. The data below is from a refractive surgery study, using the CSV-1000, conducted in a multi-center trial by investigators evaluating the Alcon excimer laser technology.

 

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)

Featured Product

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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