Waggoner Diagnostics Names Bernell Corporation Preferred Distributor
Waggoner Diagnostics, an organization that develops, manufactures, and distributes medical devices for the ophthalmic industry, specifically, color vision testing equipment, announced today that it has named Bernell Corporation as its “Preferred Distributor” for its color vision tests in the ophthalmic market. “Waggoner Diagnostics is beyond excited to join forces with Bernell, an organization who prides […]
Dr. Dvorine’s Criticism of the HRR: A Letter to the Inter-Society Subcommittee on Color Blindness
Around 1955, Dr. Israel Dvorine wrote a letter to the Inter-Society Subcommittee on Color Blindness in regards to accepting the American Optical Hardy, Rand, Rittler color vision test, also known as the AOHRR. The AOHRR was no longer printed starting in 1957, in 1991 Richmond Products printed and copyrighted a replicated version of the AOHRR […]
The Evolution of Color Vision Testing (Ishihara, HRR, Dvorine, and more)
The Evolution of Color Vision Testing German researcher Jakob Stilling, developed “Stilling’s Colour Table” in 1877, the first color vision test based on pseudoisochromatic plates. He developed the plates right after Sweden’s infamous Lagerlunda train wreck in 1875. Two trains had collided, possibly because an engineer had been unable to distinguish between red and green signal lights. Dr. […]