Which of the following is a non-invasive method to visualize the retina?

The correct choice is a non-invasive method to visualize the retina, which is Optical Coherence Tomography (OCT). OCT uses light waves to take cross-section pictures of the retina, allowing for high-resolution imaging of its different layers without requiring any invasive procedures. This method provides valuable information about retinal thickness, the presence of fluid, and various retinal pathologies, helping practitioners in diagnosing and managing conditions like glaucoma and macular degeneration.

Fundus photography is also a non-invasive technique that captures images of the interior surface of the eye, but it is generally used to visualize the overall structure of the retina rather than individual layers.

Ultrasound biomicroscopy involves the use of high-frequency sound waves to create images of the eye's anterior segment and some posterior structures; however, it is not primarily designed for detailed retinal imaging.

Fluorescein angiography is an invasive procedure that involves injecting a dye into the bloodstream and taking photographs of the retina as the dye circulates, making it unsuitable for categorization as a non-invasive method.

Each of these techniques has its unique applications, but OCT stands out for its non-invasive nature and its ability to provide detailed imaging of the retina efficiently.