Refraction

Understanding Refraction in the Eye?

In a healthy eye, light rays focus directly on the retina, creating a clear image. When the eye shape changes or the cornea or lens bends light incorrectly, it causes a refractive error. A refraction test helps determine the right prescription for eyeglasses or contact lenses.

Common Refractive Errors?

There are four main types of refractive errors:

• Myopia (nearsightedness): Can see near but distant objects are blurry
• Hyperopia (farsightedness): Can see far but near objects are blurry
• Astigmatism: Blurred or distorted vision due to irregular cornea shape
• Presbyopia: Age-related difficulty focusing on close objects

Signs You Might Need a Refraction Test?

Symptoms of refractive errors include:

• Blurred vision at near or far distances
• Eye strain or fatigue
• Headaches after reading or screen use
• Squinting to see clearly
• Difficulty reading or focusing

How a Refraction Test Is Performed?

During an eye exam, the optometrist shines light into your eye and uses lenses to measure how it bends. You’ll look through a device called a phoropter and choose which lenses make your vision clearest. This helps determine your prescription.

Treatment Options for Refractive Errors?

Corrective options include:

• Eyeglasses tailored to your prescription
• Contact lenses for convenience or aesthetics
• LASIK or other refractive surgeries for long-term correction

When to Get a Refraction Test?

If you experience frequent vision problems, headaches, or changes in your ability to focus, schedule an eye exam. Children should also be screened regularly to ensure proper vision development