What is the difference between a dilated fundus examination and a non-dilated exam?

What is the difference between a dilated fundus examination and a non-dilated exam?

• A. Non-dilated exam views the retina best.
• B. Dilated exam uses eye drops to enlarge pupil for a full retina view.
• C. Dilated exam is used solely to measure anterior segment depth.
• D. Non-dilated exam can view the entire retina without pupil dilation.

Answer: (B)

Enlarging the pupil with eye drops is what differentiates a dilated fundus exam from a non-dilated one. When the pupil is dilated, the clinician can examine the entire retina—the periphery, macula, and optic nerve—using a wider field of view. This full view helps detect issues like peripheral tears, detachments, or early retinal disease that might be missed if the pupil remains small. In a non-dilated exam, the pupil stays constricted, so the view is limited to the central retina and areas near the optic nerve; much of the peripheral retina can be hidden behind the small opening, making comprehensive assessment harder. Dilation also often involves relaxing accommodation, which aids a thorough retina check. The idea of measuring anterior segment depth isn’t the purpose of dilation in this context.

Enlarging the pupil with eye drops is what differentiates a dilated fundus exam from a non-dilated one. When the pupil is dilated, the clinician can examine the entire retina—the periphery, macula, and optic nerve—using a wider field of view. This full view helps detect issues like peripheral tears, detachments, or early retinal disease that might be missed if the pupil remains small. In a non-dilated exam, the pupil stays constricted, so the view is limited to the central retina and areas near the optic nerve; much of the peripheral retina can be hidden behind the small opening, making comprehensive assessment harder. Dilation also often involves relaxing accommodation, which aids a thorough retina check. The idea of measuring anterior segment depth isn’t the purpose of dilation in this context.