Pelli-Robson Trans-Illuminated Contrast Sensitivity Chart
Cat No 5016 for Low Vision (Choose from the drop down menu when ordering)
Cat No 5017 for Peak Contrast Sensitivity (Choose from the drop down menu when ordering)
The trans-illuminated versions are identical to the original “Gold Standard” Pelli-Robson Contrast Sensitivity Charts. These charts cover ¾ of the original contrast range and are manufactured to the same true log steps and use the same letters and letter sizes as the originals.
Trans-illumination has the advantage of uniform fixed illumination and eliminates the need for staging the room and verifying chart luminance with room lighting. These charts require using our ETDRS Illuminator Cabinet™, Cat. No. 2425 and our 85 cd/m2 lamp filter, Cat No 2427D85.
Chart 5016 designated for Low Vision uses the upper 12 contrast levels ranging from 0 – 1.65 Log CS (100% – 2.2% Weber).
Chart 5017 designated for Peak Contrast Sensitivity uses the lower 12 contrast levels ranging from 0.6 – 2.25 Log CS (25% – 0.56% Weber)
These charts are manufactured to tolerances better than the accepted standard of +/- .05 Log CS and researchers can order reports of actual contrast values to accompany their chart at the time of ordering for an additional charge.
The “A” and “B” versions of each are different letter sets to minimize memorization. (Choose from the drop down menu when ordering)