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To The Editor:
—As a layman I have been interested for some years in an effect which many people see when looking into the blue sky on a sunny day. They see what appear to be many thousands of actively moving specks or points of light which seem to be in the air a few inches or a few feet in front of them. Many report that this effect is seen most easily when shielding the eyes from direct sunlight and looking "past the objects into space."Of course there is the question as to whether this may be a "projection" of blood corpuscles or something else within the eye, or whether the eye is seeing a real source of light outside. All reporters express difficulty in estimating how far from the eye this effect is.I am wondering if you know of any professional report on this phenomenon which
Anderson SR. ENTOPIC PHENOMENON. Arch Ophthalmol. 1962;68(1):149. doi:10.1001/archopht.1962.00960030153028