Livro A Treatise on Internal Diseases of the Eyes, Including; Diseases of the Iris, Crystalline Lens, Choroid Retina, and Optic Nerve. Based on Theodore J. Rueckert's Clinical Experience in Hom*opathy.

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: sensible to the red light, but is still susceptible of the impression of the other colored rays; if it be now directed towards a white surface, being no longer sensible to the red rays contained in the white light, it perceives only the remaining component rays of white light, viz., yellow and blue, which form green, which is hence the complementary color of red.

- When the retina is in a state of intense excitement, colored spectra may appear from colored objects, although the eyes are in apparent total darkness. The green baizes or curtains in the darkened room, although almost invisible to the healthy eye, may excite red spectra in the morbidly sensitive eye; gilded frames, although they look black to the healthy eye, may excite violet colored spectra, or those formed by the combination of the red and blue rays which are the only ones then observed by the eye.

A variety of colored objects, even in a darkened room may cause the most varied and intricate combinations and separations of color only visible to the morbidly sensitive eye. Hence those drugs which cause objects to appear yellow, render the eyes insensible to blue and red rays; those which make objects appear red, have paralyzed the susceptibilities of the retina to the blue and yellow rays; those which cause greenish spectra, have left the eye susceptible to the blue and yellow rays, but not to the red; those which cause the appearance of blue colors have destroyed the susceptibility of the retina to the red and yellow rays.

Variegated spectra are produced by drugs which cause derangement of the lenses of the eye, by which its achromatic power is disturbed. It is probable that insensibility to certain colors, or color blindness may become a curable affection by aid of these hints.

Dr. Wilson of Edinbur...