Thus, in optic neuritis, the most common neuro- ophthalmological disorder, the equal increment in all colour axes is very unusual, and gives good evidence of MS.  Note these disturbances can occur when there is no significant loss of acuity.
	The sensitivity of the system is so high, that it is possible to demonstrate a temporary loss of tritan sensitivity occurs in ophthalmologists who use Argon lasers, (next slide).