It is: The anomaloscope which is a rarely used research instrument. The farnsworth 100 test is accurate and comprehensive but rarely used because the time it takes to do it and the extreme difficulty of the test.
Answered 5/6/2013
5.1k views
4 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question