More recent evidence proves that the major contribution to the smell of flatus comes from a combination of volatile sulphur compounds (vsc).[5][12] it is known that hydrogen sulphide (h2s), methyl mercaptan, mm (also known as methanethiol, mt), dimethyl sulphide (dms), dimethyl disulphide (dmds) and dimethyl trisulphide (dmts) are present and cause the smell.Those compounds are the one percent that cause the smell.
Symptoms include a whitening of the lens, which is a clear part of the eye needed for focussing, and the problem impairs sight and may even lead to blindness. The whitening or cloudiness is opaque and thus cannot be seen through. Inherited cataracts can occur at any age in the affected dog.
Human eyes contain several types of cones, but canines have more rods and have no fovea, which is what helps with the vivid image colors that humans see. This means that your dog has excellent night vision that is far superior to humans because their motion detectors are much keener than that of humans.