u/Post-reality

Keratoconus in History: the hydrodiascope, introduced in 1896, was designed as a goggle that was filled with fluid and worn over one eye. The device was able to improve visual acuity to a normal level by neutralization of irregular astigmatism and spectacle magnification.

Keratoconus in History: the hydrodiascope, introduced in 1896, was designed as a goggle that was filled with fluid and worn over one eye. The device was able to improve visual acuity to a normal level by neutralization of irregular astigmatism and spectacle magnification.

u/Post-reality — 3 days ago