What Percentage of High Myopia Patients Develop Lattice Degeneration or Peripheral Retinal Changes?

How Does Axial Length Data Predict Peripheral Degeneration Risk?

Axial length, which is the measurement from the front to the back of the eye, is the most accurate predictor of retinal risk. Patients with an axial length greater than 26 millimeters have a vastly increased probability of showing peripheral retinal holes or lattice patterns. Every additional millimeter of length increases the tension on the retinal layers, pulling them away from their underlying support structure. Monitoring axial length in children is now a standard part of myopia management to identify those who will be at highest risk for retinal issues in adulthood.

What are the Specific Monitoring Needs for Patients with Retinal Thinning?

Patients identified with lattice degeneration or peripheral changes require annual dilated fundus examinations with depressed scleral evaluation. This specialized exam allows the doctor to check the "far periphery" for any tiny holes or tears that could lead to a retinal detachment. Digital wide-field imaging is also a critical tool for documenting changes over time. For high myopes, these exams are mandatory even if their vision is perfectly clear, as retinal thinning produces no symptoms until a complication occurs.

What is the Connection Between Lattice Degeneration and Retinal Tears?

Lattice degeneration is a major risk factor because it creates areas where the vitreous jelly is more firmly attached to the thin retina. As the vitreous naturally liquifies and moves with age, it can tug on these weakened areas, "zipping" open a retinal tear. Approximately 30 percent of all retinal detachments occur in eyes with pre-existing lattice degeneration. While the lattice itself does not always need treatment, it serves as a permanent warning sign that the eye is prone to sudden, sight-threatening complications.

Why Does High Myopia Increase the Risk of Early Vitreous Changes?

The vitreous jelly inside a highly myopic eye tends to break down and liquify much earlier than in a normal eye. This premature posterior vitreous detachment (PVD) is the most dangerous moment for a high myope. When the jelly pulls away, the presence of lattice or peripheral thinning makes a tear much more likely. Education on the symptoms of a PVD, such as new floaters or flashes of light, is the most important part of a high myopia management plan.

How Can Prophylactic Laser Treatment Prevent Retinal Detachment?

In specific cases where a retinal hole or a high-risk tear is found within an area of lattice, a doctor may perform prophylactic laser retinopexy. The laser is used to create a "barrier" of scar tissue around the weakened area, effectively welding the retina to the wall of the eye. This prevents fluid from seeping under the retina and causing a detachment. While not every patch of lattice needs laser treatment, identifying the ones that do is the key to preventing permanent vision loss in the high myopia population.