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| Company | Precision Vision® | Precision Vision® | Precision Vision® | Precision Vision® | Precision Vision® |
| Item | Colenbrander Reading, Intermediate and Computer Chart (2 card set) | Colenbrander Mixed Contrast Reading Card | Patti Stripes™ Square Wave Grating Paddles | Pelli-Robson SLOAN Letter Contrast Chart | Tumbling "E" Low Contrast Flip Book |
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| Description | Designed by: Dr. August Colenbrander Conventional, high-contrast letter chart acuity captures only one aspect of visual performance. Low contrast acuity is equally important for activities of daily living, since most everyday objects have less than | Designed as a simple screen test. The usual question for a reading test is: "What is the smallest (black) line you can read?" On the contrast card one adds the question "What is the smallest (grey) line you can read?" The difference between the two | Patti Stripe paddles are highly useful for testing the contrast sensitivity of children, infants, and those with mental disabilities. The contrast sensitivity is tested by placing the gray paddle in front and the grated paddle behind and sliding it | Designed by DG Pelli, JG Robson and A J Wilkins, because they see contrast sensitivity as a realistic assessment of how well the patient sees large faint objects. The chart follows the luminance, font, and letter spacing recommendations of the | This flip book is great for vision studies and research world wide. The Tumbling "E" vision chart uses only one optotype for testing. Patients not familiar with the Roman alphabet simply have to gesture or sign which direction they see the "E" facing |
| Features | - Calibrated for 40 cm (16 in), 63 cm (25 in), 100 cm (40 in)
- Measures 8.5" x 11"
- Includes complete instructions and recording sheet
- Uses 10% calibrated Contrast Sensitivity level with Acuity
| - Mixed high-contrast and 10% contrast
- Unrelated simple sentences at 4th grade level
- Serves as an educational tool to demonstrate the effect of contrast deficits to patients and family members.
- Multi-distance testing
- Acuity range 10m to 0.6m in Times Roman Font (20/320, 6/95 to 20/16, 6/4.8 equiv.)
- Includes test instructions and diopter ruler
- Measures 43 x 38 cm (17 x 11 in.)
- Folds in half to 21.5 x 38 cm (8.5 x 11 in.)
- Also available in various languages
| - Patti Stripes consists of six gratings at 0.3, 0.6, 1.2, 2.4, 4.8 and 9.6 CPCM (cycles per centimeter) along with the CPD (cycles per degree) for the three test distances of 25, 50, and 100 cm (10, 20 and 40 in.) printed on the handle.
- Set includes four paddles, three with gratings printed on both sides and one solid gray face for presentation.
- Extremely durable made from 4 mm plastic
- Can be washed with soap and water or cleaned with alcohol
- These will hold up to years of service
- Measures 17.8 X 32 cm (7 X 12.5 in.)
| - Features Traditional Sloan Optotypes
- For use at 40 in (1m)
- Includes two charts and two scoring pads
- Illumination of 85 cd/m² is key to good results
| - For testing at 2 meters (6.5 ft.)
- Each page it's own contrast level at 100%, 2.5% and 1.25%
- Acuity range 20M to 1.6M
- Includes test instructions, recording forms (Cat. No. 2514) and soft-tipped pointer
- Measures 13.5 X 14 in.
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| Product Number | 4070 | 4061 | 2533 | Pelli-Robson | 2380 |
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