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—In response to the question raised in the second paragraph of Dr Bond's letter, I would like to point out that the atraumatic method of tear collection by strips of filter paper does not cause substantial damage and certainly does not cause bleeding of the conjunctiva. It is most unlikely that the specimens were contaminated with blood and that is the reason testing for occult blood was not considered necessary.
Darrell RW. Alcohol and Phenolic Germicides Not Indicated for Hepatitis B Contamination-Reply. Arch Ophthalmol. 1979;97(10):1995. doi:10.1001/archopht.1979.01020020410034