The most common cause of a torn retina is the vitreous, a gel-like substance inside your eye, pulling away from the retinal surface as you age. This process, called posterior vitreous detachment (PVD), happens to roughly two-thirds of people between ages 66 and 86. Most of the time the vitreous separates cleanly, but in about 8% of cases it tugs hard enough to tear the retina.
How Aging Creates the Conditions for a Tear
In your early 20s, the inside of your eye is filled with a firm, gel-like substance called vitreous humor. This gel is lightly attached to the retina, the thin layer of tissue lining the back of your eye that converts light into the signals your brain reads as vision. Over decades, the vitreous gradually turns from a solid gel into liquid. Without its structure, the gel collapses inward and peels away from the retina.
This separation is rare before age 40 and usually happens after 50. In most people it causes nothing more than a few temporary floaters. But if the vitreous is stuck to a particular spot on the retina, it doesn’t peel away smoothly. Instead, it pulls on that spot as it shrinks, and that mechanical traction can rip a small hole or flap in the retinal tissue. The retina itself is extremely thin, so it doesn’t take much force to tear it.
Thin Spots That Make the Retina Vulnerable
Not everyone’s retina is equally tough. A condition called lattice degeneration creates patches where the peripheral retina is abnormally thin, the vitreous above those patches has already liquefied, and the remaining vitreous is more firmly stuck to the edges. That combination of weakness and adhesion makes tears much more likely. Estimates of how many retinal tears occur next to lattice lesions range from 28% to as high as 82.5%, depending on the study population.
Lattice degeneration is common and often causes no symptoms on its own. Many people don’t know they have it until an eye exam reveals the characteristic thinned areas near the edges of the retina. If you’re told you have lattice degeneration, it doesn’t mean a tear is inevitable, but it does mean your risk is higher than average, particularly as the vitreous begins to separate with age.
Nearsightedness as a Risk Factor
People with moderate to high myopia (nearsightedness) have longer-than-average eyeballs. That extra length stretches the retina thinner across a larger surface area, making it more fragile. Myopic eyes also tend to undergo vitreous changes earlier in life, so the pulling forces that cause tears can start sooner. The combination of a thinner retina and earlier vitreous separation is why nearsighted people are consistently overrepresented in retinal tear statistics.
Blunt Trauma to the Eye
A direct hit to the eye, from a ball, a fist, an airbag, or a fall, compresses the eyeball rapidly. That compression sends a pressure wave through the vitreous. The initial impact pushes the retina against the rigid outer wall of the eye (the sclera), which actually limits damage in that phase. The real danger comes a fraction of a second later during the rebound, when negative pressure pulls the retina inward, away from the eye wall. Research using computer models of the eye shows that strain at the vitreous base, the ring where the vitreous is most firmly anchored, can reach 25% during blunt trauma, with strain rates high enough to tear or detach the tissue.
Traumatic tears can happen at any age and often appear at the far periphery of the retina, making them easy to miss without a dilated exam. Young adults, particularly those involved in contact sports or who sustain facial injuries, account for a significant share of trauma-related retinal tears.
Retinal Tears After Cataract Surgery
Cataract surgery is one of the most common operations in medicine, and it’s overwhelmingly safe, but removing the eye’s natural lens changes the internal environment in ways that can accelerate vitreous separation. In a large study of over 3.1 million eyes, 0.17% developed a retinal tear within a year of cataract surgery. That’s a small number, but the timeline matters: about 30% of those tears appeared within three months and nearly half within six months of the procedure.
The mechanism is straightforward. Once the lens is replaced with a thinner artificial one, the vitreous has more room to move. That increased mobility can speed up the same pulling-away process that causes age-related tears. If you’ve recently had cataract surgery, new floaters or flashes of light in the operated eye are worth getting checked promptly.
What a Tear Feels Like
A retinal tear itself is painless because the retina has no pain receptors. What you notice instead are the side effects of the vitreous tugging on or tearing the tissue. Flashes of light, often described as brief streaks or flickers in your peripheral vision, happen because mechanical pulling stimulates the retina the same way light does. Your brain can’t tell the difference, so it interprets the signal as a flash.
A sudden increase in floaters, especially small dark specks or cobweb-like shapes, can indicate that a tear has released pigment cells or a small amount of blood into the vitreous. Some people describe a shower of tiny dots appearing all at once. A more ominous sign is a shadow or curtain creeping across part of your visual field, which suggests fluid has already begun seeping through the tear and lifting the retina off its base. At that point, the tear is progressing toward a retinal detachment.
Why Tears Matter Beyond the Tear Itself
A retinal tear is not automatically an emergency, but it creates the conditions for one. The retina sits on top of a layer of supportive tissue. Once a hole opens, the liquefied vitreous can flow through it and pool underneath the retina, peeling it away like wallpaper loosening from a damp wall. That peeling is a retinal detachment, and it can cause permanent vision loss in the affected area if not treated quickly.
Tears caught early can typically be sealed with laser treatment or a freezing procedure, both of which create a scar that bonds the retina back to the underlying tissue and prevents fluid from getting through. These are outpatient procedures that take minutes. Once a detachment has developed, treatment becomes more involved and recovery takes longer, with less certainty about how much vision will return. The difference between a tear that’s treated in a clinic and one that becomes a detachment requiring surgery is often just a matter of days.