The ophthalmoscope, he said, will show you the crimson at the back of the eye, but the colour is not and cannot be reflected on the surface of the iris.
"Afoot in England"
W.H. Hudson
We are familiar with the effect when polished and wet surfaces, such as glass, stone, and water, shine crimson in the light of a setting sun; but there is also the fact, which is not well known, that the eye may show its own hidden red-the crimson colour which is at the back of the retina and which is commonly supposed to be seen only with the ophthalmoscope.
"Afoot in England"
W.H. Hudson
As yet there is no instrument for the ear comparable to the ophthalmoscope.
"Civics and Health"
William H. Allen