Although rare, ocular reticulum cell sarcoma presents a recognisable clinical pattern, as confirmed by 3 new cases. Typical patients, in their sixth and seventh decades, initially complain of gradual visual loss. Examination reveals 'uveitis' with prominent vitreous debris and/or chorioretinal infiltrative lesions. Topical steroid and mydriatic therapy is ineffective. Reticulum cell sarcoma in the central nervous or other systems may precede or accompany the ophthalmic presentation. In an increasing number of cases tissue diagnosis and effective therapy have followed vitreous aspiration.