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Retinoscopy: (ret-i-nos-ko-pee) (n) light beam test used to detect refractive errors.

Andrew Jay Cross has written:

'A system of ocular skiametry including such portions of optometry as are pertinent to the use of the \\' -- subject(s): Accessible book, Retinoscopy

Retinoscopy or ophthalmoscopy is the process of examining the retina of the eye to examine the blood vessels and other structures.

Joseph Irvine Pascal is not a known author. Perhaps you are thinking of Blaise Pascal, a French mathematician, physicist, inventor, writer, and Catholic theologian known for his contributions to mathematics and physics.