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.
Trauma to a dog's eye can cause the lens capsule to rupture. In a rupture, the contents of the lens leak out. This can lead to a severe form of uveitis, which can then lead to cataracts. If your dog suffers any kind of injury to the eye, I recommend you get her to the vet as soon as possible.