In 1877 he introduced " Stilling's colour table ", which were pseudo-isochromatic charts used in diagnosis of color blindness.
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He also performed extensive research of color blindness, and developed a pseudo-isochromatic color chart that was formerly used to test color blindness.
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Some pseudo-isochromatic plate books have the pages in binders, so the plates may be rearranged periodically to give a random order to the test.
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After DeCurtis failed the first test, called the Dvorine Pseudo-Isochromatic Plates and known as the PIP test, D'Agostino gave him a second test, investigators said, which he passed.
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Metro-North's backup system is a more in-depth version of its primary color-blindness test, the Ishihara Pseudo-Isochromatic Test, said Dan Brucker, a Metro-North spokesman.
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These early products, described as " isochromatic " or " orthochromatic " depending on the manufacturer, made possible a more accurate rendering of colored subject matter into a black-and-white image.
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But the trick, a behavior learned by many of the 6 to 8 percent of American males who are born with defective color vision, cannot be used on the polka-dot test, called a pseudo-isochromatic test.
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D'Agostino apparently did not note that DeCurtis'performance on the pseudo-isochromatic test had fallen sharply from one year to the next, which several ophthalmologists said Wednesday was a strong indication of the need for follow-up.
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His career spanning six decades, Bell worked in nearly every major early photographic process, including daguerreotype, collodion processes, albumen prints, stereo cards, and early film . the use of pyrogallic acid to recover gold from waste solutions, and the development of isochromatic plates.
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