Clinical Trial Items, Ophthalmic Clinical Research
SKU : 7021 7022 7023
Jackson Cross Cylinder 0.25 and 0.50 and 1.00
SKU : 7021 7022 7023
Hand Held Jackson Crossed Cylinder is mounted on a knurled handle, making it easy to flip.
Hand Held Jackson Crossed Cylinder is mounted on a knurled handle, making it easy to flip.
The high optical quality lens has red and black axis etching.
| Brands | Precision Vision |
|---|
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Continuous text cards simulate everyday tasks and activities that patients may encounter, such as reading the newspaper.
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 measurements will be obvious and can simply be expressed in lines. Preliminary findings indicate a 2 or 3 line difference is normal.
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Original Series Sloan Letter ETDRS Chart 2
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Only standardized format accepted in studies sponsored by the National Eye Institute.
Designed for use in clinical studies and low vision evaluations where accurate, repeatable visual acuity measurements are required.
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