You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Intractable secondary galucoma is seen in: and explain in detail?
Diffuse iris melanomas are associated with intractable secondary glaucomas. 'Iris melanomas are usually nodular, but diffuse tumors can involve the iris stroma extensively and infiltrate the out flow system to cause intractable secondary glaucoma'. Ref: The Wills Eye Hospital Atlas of Clinical Ophthalmology, By William Tasman, Edward A. Jaeger, Wills; The Eye:Basic sciences in Practice, 2nd Edition, Page 422