**Core Concept**
Enucleation refers to the surgical removal of the entire eyeball, often performed in cases of severe eye trauma, intraocular malignancies, or intractable glaucoma. This procedure is considered a last resort due to its irreversible nature.

**Why the Correct Answer is Right**
The absolute indication for enucleation is a malignant intraocular tumor, such as retinoblastoma, which is a type of cancer that originates in the retina. In these cases, enucleation is performed to prevent the spread of the tumor to other parts of the body. The decision to perform enucleation is usually made when the tumor is large, has a high risk of spreading, or is resistant to other treatments. The eyeball is removed in its entirety, along with the tumor, to prevent recurrence.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as enucleation is not typically performed for conditions like cataracts or age-related macular degeneration, which are common causes of vision loss but do not require the removal of the entire eyeball.

**Option B:** This option is incorrect as enucleation is not a treatment for glaucoma, although it may be performed in severe cases where the intraocular pressure is extremely high and other treatments have failed.

**Option C:** This option is incorrect as enucleation is not typically performed for conditions like retinal detachment, which can often be treated with surgery to reattach the retina.

**Clinical Pearl / High-Yield Fact**
A key consideration when deciding whether to perform enucleation is the patient's visual prognosis and the potential benefits of preserving the eye versus the risks associated with the procedure. In cases where the eye is severely damaged or the tumor is advanced, enucleation may be the best option to prevent further complications and maintain the patient's overall quality of life.

**Correct Answer:** D.