When we look straight at an object we see not only the object focused on, but also the objects to the side of it, which is defined by limits on all directions. this is the visual field. Scotoma is a non seen area within a seeing area. it can be due to disorders of the optic nervemore...
This Rosenbaum Pocket Vision Screening Card utilizing PV Numbers provides 20/800 distance equivalent testing when held at 16 inches (40 cm) distance. This card fits easily in a pocket for quick, convenient visual acuity screening and includes matching 20/200 Jaeger notation. &nbsmore...
Chart Measures : 7 inch x 9 inch (17.8 cm x 22.9 cm).
Cord : 16 inch
Testing Distance : 16 inch / 40CM
Model No. : DP-5022
Standardized adult Sloan Letter near vision card with proportionally spaced (logMAR) lines in ETDRS, format, line sizes range from 20/400 to 20/10 (6/120 to 6/3) equivalent. This format facilitates natural left to right reading, while letter sizes decrease making testing faster amore...