Deep set eyes occur when the eyeballs sit further back in the skull than average, creating a noticeable shadow beneath the brow bone. For most people, this is simply an inherited facial structure. But deep set eyes can also develop over time from aging, trauma, or certain medical conditions. Understanding the difference between a natural eye shape and a sign of something else is worth knowing.
The Anatomy Behind Deep Set Eyes
Your eye sits inside a bony cavity called the orbit. In a deep set eye, the globe (the eyeball itself) is positioned far behind the surrounding orbital rims, particularly the upper and side rims. This creates a prominent brow bone that casts a shadow over the eye, making the crease of the upper eyelid more visible and giving the face a more sculpted, angular look.
This positioning is determined by the size and shape of the orbital bones, the amount of fat cushioning behind and around the eye, and the overall proportions of the surrounding facial skeleton. When the orbital cavity is naturally larger or deeper relative to the size of the eyeball, the eyes appear set back. Conversely, a shallower orbit pushes the eye forward. Eye protrusion can actually be measured in millimeters using a special instrument. The normal range is roughly 12 to 21 mm from the orbital rim to the front of the eye, though this varies by sex and ethnicity. Caucasian men average about 16.5 mm, while African American men average about 18.5 mm. Women tend to measure about 1 to 1.5 mm less than men of the same background.
Genetics: The Most Common Cause
The single biggest reason people have deep set eyes is that they inherited them. Orbital bone depth, brow ridge prominence, and the amount of periorbital fat are all strongly influenced by your genetic background. If your parents or grandparents have deep set eyes, you likely will too. This type of deep set appearance is present from childhood, stays consistent over time, and is completely normal. It’s simply one of many possible eye shapes, alongside hooded, protruding, round, and almond-shaped eyes.
How Aging Changes Eye Depth
Even if your eyes weren’t particularly deep set when you were younger, they can start to look that way by middle age. Several forces work together to make this happen. The fat pads that sit just beneath and around the eyes shrink over time, a process driven by gravity, hormonal shifts, chronic sun exposure, and smoking. At the same time, the facial bones themselves slowly resorb, meaning the bony support structure gradually loses volume. Skin loses collagen and elasticity, and the muscles around the eyes weaken.
The combined result is a hollowed-out appearance, especially in the area below the lower eyelid known as the tear trough, a diagonal groove that runs from the inner corner of the eye down across the top of the cheekbone. Volume loss in the infraorbital fat pads is what makes this groove more visible, and it’s one of the hallmarks of an aging face. This age-related deepening is a gradual, universal process rather than a medical problem, though it can make people look more tired than they feel.
Deep Set Eyes vs. Sunken Eyes
People often use “deep set” and “sunken” interchangeably, but they describe different things. Deep set eyes are a bone-structure trait you’re born with. The eyes simply sit further back in a well-defined orbit, and the surrounding skin and tissue remain healthy and full.
Sunken eyes, by contrast, tend to appear later in life or in response to specific triggers. They look loose in the socket, with a hollowed-out quality, pronounced dark circles, and visible wrinkling. They make you look tired, stressed, or unwell. Common temporary causes include dehydration, chronic sleep loss, and prolonged stress. If you notice a sudden change in how deep or hollow your eyes appear, that’s a different situation from simply having naturally recessed eyes, and it may point to a medical issue.
Medical Conditions That Cause Sunken Eyes
When the eyes sink backward enough to be considered clinically abnormal, the medical term is enophthalmos. A difference of more than 2 mm in protrusion between your two eyes is considered abnormal and warrants further evaluation. Several conditions can cause this.
Orbital Fractures
Trauma to the face, often from car accidents or physical fights, can fracture the thin bones surrounding the eye. A blowout fracture of the orbital floor is one of the most common types. When the floor of the orbit breaks, the fat and tissue that normally support the eye can shift downward into the sinus cavity below, causing the eye to sink back. This type of enophthalmos is usually noticeable soon after the injury.
Silent Sinus Syndrome
This is a condition where the maxillary sinus (the large sinus beneath the eye) slowly collapses inward due to chronic sinus disease. As the orbital floor weakens and curves downward, the eye gradually drops and sinks back. People with silent sinus syndrome often don’t have typical sinus symptoms like pain or congestion, which is why it’s called “silent.” They usually notice it only when one eye starts looking different from the other.
Hormonal and Genetic Disorders
Acromegaly, a condition where the pituitary gland produces too much growth hormone, can enlarge the facial bones and change the proportions around the eyes, making them appear suddenly deeper set. Rarer genetic conditions also play a role. SHORT syndrome, for example, involves a lack of fatty tissue under the skin, particularly in the face, arms, and chest, which gives the eyes a sunken appearance. Sanjad-Sakati syndrome, a very rare inherited disorder, includes deep set, small eyes as part of its characteristic facial features. Horner’s syndrome, which affects the nerves on one side of the face, can cause one eye to appear more sunken than the other.
Dehydration and Illness
When the body is significantly dehydrated, the tissues around the eyes lose volume quickly, creating a temporary sunken look. Severe weight loss, chronic illness, and conditions that cause widespread tissue wasting can produce a similar effect. In these cases, the appearance typically improves once the underlying issue is treated.
Cosmetic Options for Deep Set or Hollow Eyes
For people who are bothered by the appearance of deep set or hollow eyes, the most common nonsurgical approach is dermal filler injected into the tear trough and infraorbital area. Hyaluronic acid fillers are widely used for this purpose. They work by replacing lost or displaced volume beneath the lower eyelid, smoothing the transition from the eyelid to the cheek. Most people seek this treatment because they want to look less tired or reduce dark circles. Results typically last several months to over a year, depending on the product and individual metabolism.
Fat grafting is a more permanent surgical option. Fat is harvested from another part of the body and injected around the eyes to restore volume. For people whose deep set appearance is caused by the bone structure itself rather than volume loss, some opt for orbital rim implants, though this is a more involved procedure. For those with enophthalmos caused by a fracture or silent sinus syndrome, surgical repair of the orbital floor is often the primary treatment, with the cosmetic improvement being a secondary benefit.