Overview
Nearsightedness happens when the eye focuses light in front of the retina instead of directly on it. This causes faraway objects to appear blurry while nearby objects may stay clear. Myopia can be mild or more severe, and it may increase as a child grows.
Key Symptoms
The main symptom is blurry distance vision, such as trouble seeing a board at school, road signs, or faces across a room. Some people squint, sit very close to screens, or complain of eyestrain or headaches after visual tasks. Children may not realize their vision is different, so changes in school performance or behavior can be clues.
Causes and Risk Factors
Myopia is linked to the shape and growth of the eye, especially when the eyeball becomes too long from front to back. It tends to run in families, so having one or both parents with myopia can increase risk. Limited time outdoors and a lot of close-up visual work may also play a role in some people.
Who Is Affected
Myopia can affect children, teenagers, and adults in all parts of the world. It often begins in childhood and may progress during the growing years. Some people have mild myopia, while others develop high myopia, which needs closer follow-up because it can increase the risk of other eye problems.
Prevention
Myopia cannot always be prevented, but regular eye checks can help find it early. For children, spending time outdoors may support healthy visual development, and balanced screen and reading habits may help reduce strain. Parents can encourage breaks during near work and pay attention to signs that a child is struggling to see at a distance.
Diagnosis and Tests
An eye care professional diagnoses myopia with a vision exam and tests that measure how the eyes focus light. The exam may include reading an eye chart and checking whether glasses or lenses improve distance vision. Children and adults with changing vision may need repeat exams over time.
Treatment Categories
Treatment focuses on correcting vision and monitoring eye health. Common options include glasses and contact lenses, and some people may discuss other vision-correction methods with an eye specialist. In children, an eye care professional may also talk about approaches intended to slow myopia progression.
Living With It
Many people with myopia do well with regular vision correction and follow-up eye care. Keeping prescriptions up to date can support school, work, driving, and daily activities. If vision changes quickly, correction no longer seems to work, or one eye sees much worse than the other, medical review is important.
When to Seek Medical Care
Make an appointment if you or your child has blurry distance vision, frequent squinting, headaches, or trouble seeing in school, at work, or while driving. Regular eye exams are important, especially for children and for people with strong prescriptions or rapidly changing vision. Seek medical advice if there are new flashes, floaters, distorted vision, or a sudden drop in sight.
When It May Be an Emergency
Get urgent medical care right away for sudden vision loss, a curtain-like shadow over part of vision, sudden many new floaters, flashes of light, or eye injury. These symptoms can signal a serious eye problem that needs prompt attention. Severe eye pain or redness with reduced vision also needs urgent evaluation.