Which two variants of occult CNV are identified?

Identifying the two variants of occult choroidal neovascularization (CNV) is essential, particularly in the context of age-related macular degeneration (AMD) and other retinal disorders. The correct choice highlights the association of fibrovascular pigment epithelial detachment (PED) and late lesions of undetermined source with occult CNV.

Fibrovascular PED is characterized by a thickening of the retinal pigment epithelium (RPE) with underlying neovascular tissue, which can lead to visual impairment, primarily when it is related to CNV. The term "late lesion of undetermined source" pertains to the appearance of CNV without an obvious cause, making it difficult to categorize based on other known factors such as AMD. These variants emphasize the complex and often hidden pathology associated with occult CNV, which can significantly impact patient management and treatment strategies.

The other choices do not appropriately define the variants of occult CNV crucial for diagnosing and treating conditions such as AMD, focusing instead on unrelated retinal conditions or forms of degeneration. Understanding these specific variants is pivotal for healthcare professionals in the field of ophthalmology to provide accurate prognoses and tailored interventions for patients experiencing visual disturbances related to CNV.