The Royal Society discussed Leeuwenhoek's observations in Letter L-147 about the crystalline humour of the eye

May 31, 1684

Birch, History, vol. IV, p. 298, 21 May 1684 (O.S.) in London:

Upon mentioning Mr. LEEWENHOECK's letter on the crystalline humour of the eye, Dr. GREW remarked, that this humour, if it were only boiled, shewed several parallel lines or threads running on the surface.