About Myopia (Nearsightedness)
The causes of myopia include:
- Axial elongation: The eyeball becomes longer than normal, leading to the focal point of light falling in front of the retina instead of on it.
- Changes in the shape of the cornea or lens: These changes can cause the light entering the eye to bend incorrectly, resulting in blurred distance vision.
The non-modifiable risk factors for myopia cannot be changed or controlled. These include:
- Genetics: Having parents with myopia increases the likelihood of developing the condition.
- Ethnicity: Certain ethnic groups have a higher prevalence of myopia.
The modifiable risk factors for myopia can be influenced or changed. These include:
- Environmental factors: Spending less time outdoors and engaging in excessive near work activities, such as reading or using electronic devices for prolonged periods, may increase the risk of developing myopia.
- Education level: Higher levels of education have been associated with an increased risk of myopia.
It's important to note that these risk factors do not guarantee the development of myopia, but they may contribute to its occurrence. Regular eye examinations and following good eye care practices are essential for maintaining optimal eye health.
The most common early symptoms of myopia include:
- Blurry vision when looking at objects in the distance
- Eyestrain
- Needing to squint to see clearly
- Headaches
As myopia progresses or becomes more severe, additional symptoms may occur, such as:
- Trouble seeing distant objects clearly
- Eyestrain or soreness
- Feeling tired after reading or doing close work
- Increased risk of other eye problems, like retinal detachment
It's important to note that individuals with mild myopia may not experience any symptoms at all. If you are experiencing any of these symptoms, it's recommended to speak with an optometrist who can evaluate your vision and provide appropriate recommendations. They may suggest glasses, contact lenses, or other treatment options based on your individual needs.
To diagnose myopia, healthcare providers commonly perform the following examinations, tests, and procedures:
- Medical history: The doctor will ask about your symptoms and any previous diagnoses.
- Physical exam: This involves a thorough examination of your eyes to assess visual acuity (sharpness of vision) and check for any signs of myopia.
- Refraction test: This test checks how well your eyes focus light. It uses a device called a phoropter, where you look through different lenses to find the best fit for your vision, or an autorefractor, which measures your vision automatically. It helps determine the exact prescription for corrective lenses.
- Visual acuity test: This test assesses how well you can see at various distances using an eye chart. It helps determine the severity of your myopia.
- Retinal examination: This involves examining the back of your eye (retina) using specialized instruments to check for any abnormalities or changes associated with myopia.
Additional examinations, tests, and procedures to determine the severity of myopia may include:
- Slit-lamp examination: This examination allows a detailed view of the structures within the front of your eye, including the cornea, iris, and lens. It helps identify any complications or abnormalities associated with myopia.
- Optical coherence tomography (OCT): This imaging test provides cross-sectional images of your retina, allowing healthcare providers to assess its thickness and detect any abnormalities.
- Axial length measurement: This test measures the length of your eyeball, which is an important factor in determining the severity of myopia. It can be done using ultrasound or optical biometry.
- Visual field test: This test evaluates your peripheral vision and can help detect any visual field defects associated with advanced stages of myopia.
Remember, these are general examinations, tests, and procedures used in diagnosing and assessing myopia. Your healthcare provider will determine which specific tests are necessary based on your individual circumstances.
The goals of treatment for myopia are to slow its progression, reduce the risk of serious eye problems, and improve vision through corrective lenses like glasses or contacts. Here are some recommended treatments and how they work:
- Medications: Atropine drops may be used to slow down the progression of myopia. Atropine works by relaxing the muscles in the eye, which helps prevent the eyeball from growing too long and worsening myopia.
- Therapies: Orthokeratology lenses are a type of contact lens that temporarily reshapes the cornea while you sleep. This helps to correct your vision during the day and can also slow down the progression of myopia.
- Therapeutic procedures: Refractive surgery, such as LASIK or PRK, can be considered for individuals with stable myopia. These procedures reshape the cornea permanently to correct vision.
- Self-care and health behavior changes: Encouraging outdoor activities and reducing near work activities, such as reading or using electronic devices for extended periods, can help in controlling myopia progression.
It's important to note that these treatments should be discussed with a healthcare professional who can provide personalized advice based on individual circumstances.
Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation.Side effects can occur. Check with your health care professional or read the information provided with your medication for side effect information.