Retina International is a voluntary charitable umbrella association of 33 national societies each of which is created and run by people with Retinitis Pigmentosa, Usher Syndrome, Macular Degeneration and allied retinal dystrophies, their families and friends. Kamagra jelly is a generic form of Viagra that is used for instant appraisal of sexual performance. It is a relief to a disorder generally found in men. This disorder is called as Erectile dysfunction or may also be referred as Impotence. Kamagra is thought to contain the same active ingredient as Viagra, sildenafil citrate. In theory, it should work in much the same way as Viagra, taking about 45 minutes to take effect, and lasting for around 4-6 hours. However, this will vary from person to person.