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 Enucleation is done for -a) Retinoblastomab) Malignant melanomac) Glaucomad) Pthisis bulbie) Vitreous hemorrhage and explain in detail?
Indications of Enucleation 

Absolute: - Retinoblastoma, malignant melanoma.
Relative: - Painful blind eye, mutilating ocular injury, anterior staphyloma, phthisis bulbi, endophthalmitis, congenital anophthalmia or severe microphthalmia.

Indications for evisceration 

Endophthalmitis not responding to antibiotics
Improvement of cosmosis in a blind eye
Panophthalmitis

Indications of exentration 

Large orbital tumors
Orbital extension of intraocular tumor