Why Do I Need an Eye Exam for Empty Sella Syndrome?

It is completely normal to feel confused when your endocrinologist or neurologist sends you to an eye doctor for a pituitary issue. The reason for this referral comes down to anatomy. Your pituitary gland sits in a small, bony pocket at the base of your skull called the sella turcica. Directly above this pocket sits the optic chiasm, the critical intersection where your optic nerves cross to send visual information to your brain ^[1].

When an MRI report says “empty sella,” it usually means the pituitary gland is flattened against the bone and less visible, making the space look empty on the scan—not that the gland has entirely disappeared ^[2]. Because the optic nerves and chiasm are so close to the pituitary gland, some of the conditions that cause an empty sella can also affect your vision. An eye exam (specifically a neuro-ophthalmology assessment) is often recommended to check for two main issues: signs of elevated fluid pressure in the brain, and the rare possibility that the optic chiasm is dipping down into the empty space.

Important Safety Notice: A routine eye referral is for screening and monitoring. If you experience sudden or rapidly worsening vision loss, a new visual field defect, new persistent double vision, or a severe and worsening headache accompanied by vomiting or neurological symptoms, do not wait for a routine appointment. Seek urgent or emergency medical evaluation.

The Link Between Empty Sella and Brain Fluid Pressure

In some cases of primary empty sella (when the condition happens on its own without prior surgery or illness), the flattening of the pituitary gland may be associated with chronically elevated pressure from the cerebrospinal fluid (CSF) that bathes the brain ^[3]. This condition of high fluid pressure is known as Idiopathic Intracranial Hypertension (IIH).

When CSF pressure is elevated, it can push against the optic nerves ^[4]. This pressure disrupts the normal flow within the nerve fibers, causing the optic nerves to swell at the back of the eyes—a condition called papilledema ^[5]. If severe or persistent, papilledema can cause permanent visual field loss ^[6].

However, having a primary empty sella on an MRI does not mean you automatically have high intracranial pressure ^[7]. In fact, an empty sella is often an incidental finding in people with perfectly normal pressure and healthy vision ^[8]. Because an MRI alone cannot definitively prove whether your fluid pressure is high, an eye exam helps by looking directly at the optic nerves for signs of swelling ^[9].

Note: An eye exam evaluates visual function and optic nerve health, but it cannot directly measure brain fluid pressure or diagnose IIH on its own. A full evaluation for IIH relies on your symptoms and may require additional imaging or a lumbar puncture ^[9].

When the Optic Chiasm Drops (Secondary Empty Sella)

Secondary empty sella occurs when the space becomes partially or completely empty following pituitary surgery, radiation, or the shrinking of a pituitary tumor ^[2].

Because there is no longer a normal-sized tumor or gland filling that space, the structures above it can sometimes sink downward ^[10]. In rare cases, the optic chiasm can herniate (drop down) or become tethered by scar tissue into the empty sella ^[11]. This traction on the chiasm can stretch the nerves and may lead to visual changes, most notably bitemporal field loss—which means losing the outer halves of your visual fields in both eyes ^[1]. The eye exam helps determine if an MRI finding of a descending chiasm is actually affecting your visual function, as it can sometimes happen without causing any symptoms ^[12].

What to Expect at the Eye Exam

A neuro-ophthalmology evaluation is more detailed than a standard glasses check and involves several key tests ^[13]:

• Dilated Fundus Exam: The doctor uses eye drops to widen your pupils so they can look at the back of your eyes for papilledema ^[14]. Tip: Dilation causes temporary blurry vision and light sensitivity, so bring sunglasses and consider having someone drive you.
• Visual Field Testing (Perimetry): You will be asked to click a button when you see small flashes of light. This maps your peripheral vision to detect blind spots caused by pressure or nerve tethering ^[6].
• Optical Coherence Tomography (OCT): This is a quick, painless scan that estimates the thickness of your retinal nerve fiber layers ^[15]. OCT is used alongside visual field testing to help quantify swelling or nerve loss and monitor trends over time ^[16].

What the Eye Exam Does Not Tell You

A normal, reassuring eye exam only means your optic nerves and visual pathways are currently healthy. It does not test your pituitary hormones ^[2]. You will still need to follow up with your endocrinologist, who will likely use blood tests to ensure your flattened pituitary gland is producing adequate levels of cortisol, thyroid, reproductive, and growth-related hormones.