This section is from the book "Smith's Family Physician", by William Henry Smith. See also: Natural Physician's Healing Therapies: Proven Remedies that Medical Doctors Don't Know.
Before examining any person with suspected Cataract the pupil should be dilated with Belladonna, and then if there be Cataract, there will be seen an opaque body of a gray, bluish white, or amber colour, behind the pupil. The patient usually states that his vision has become gradually impaired; that objects appear as if surrounded with a mist, or as if a cloud was interposed between them and the eye; and that the sight is better in the evening, or when the back is turned to the window; or after the application of Belladonna, evidently because the pupil of the eye being dilated under those circumstances, permits more light to pass through that part of the lens which is yet transparent. In the most confirmed cases, the patient is able to distinguish day from night.
Of course, in these cases, there is nothing will give relief but the knife of the surgeon.