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REFRACTIVE ERRORS

DEFINITION OF REFRACTIVE ERRORS

Refractive errors are common vision problems that occur when the eye does not bend (refract) light properly, causing blurred vision. These errors result from the shape of the eye, cornea, or lens, affecting the ability to focus light directly onto the retina. Refractive errors can impact daily activities like reading, driving, and screen use, but they are easily corrected with glasses, contact lenses, or surgery.

RISK FACTORS OF REFRACTIVE ERRORS

  • Genetics
  • Aging
  • Excessive Screen Time
  • Eye Injury or Surgery
  • Systemic Conditions

SYMPTOMS

 

                  • Many people squint in an effort to sharpen their vision temporarily

                  • Common in both children and adults with uncorrected refractive errors

                      • Blurred vision may occur gradually or suddenly.

                      • Objects may appear wavy (metamorphopsia), especially with macular involvement.

                        • Result from eye strain due to constant effort to focus

                        • Particularly common after prolonged reading, screen use, or driving

                    • Can occur if astigmatism is severe

                    • A single object may appear as two overlapping images

                    • Glare, halos around lights, or reduced clarity in low light

                    • Often seen in myopia or astigmatism

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TREATMENT TYPES

          • Most common and non-invasive option.
          • Corrects myopia, hyperopia, astigmatism, and presbyopia.
        • Available in soft, rigid, toric, and multifocal designs.
        • Ortho-K (Orthokeratology) lenses can temporarily reshape the cornea.
              • Reshapes the cornea using a laser..
                    •  Suitable for thinner corneas..
    •  Minimally invasive laser surgery.
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FAQS

Refractive errors occur when the shape of the eye prevents light from focusing properly on the retina, leading to blurred or distorted vision. They are the most common cause of vision problems worldwide and include:

  • Myopia (nearsightedness)

  • Hyperopia (farsightedness)

  • Astigmatism

  • Presbyopia

      • Refractive errors are primarily caused by abnormalities in the shape of the eye:

        • Myopia: The eyeball is too long, or the cornea is too curved.

        • Hyperopia: The eyeball is too short, or the cornea is too flat.

        • Astigmatism: The cornea or lens has an irregular shape.

        • Presbyopia: Age-related loss of the eye’s ability to focus on near objects, due to stiffening of the lens.

        Genetics, age, and environmental factors (like prolonged close-up work) can also contribute.

          • Blurred vision (near, far, or both)

          • Eye strain or tiredness

          • Headaches, especially after reading or screen use

          • Squinting to see clearly

          • Difficulty seeing at night

          • Needing to hold books or screens closer or farther away

          • A comprehensive eye examination by an optometrist or ophthalmologist, including:

            • Visual acuity testing (eye chart reading)

            • Refraction assessment (using lenses to measure focus)

            • Retinal and slit-lamp exams to rule out other eye conditions

             

          • Treatment options include:

            • Eyeglasses – the simplest and safest method

            • Contact lenses – for those preferring a glasses-free option

            • Refractive surgery – procedures like LASIK, PRK, or SMILE to permanently reshape the cornea

            • Reading glasses – specifically for presbyopia

            Your provider will recommend the best solution based on your vision needs and lifestyle.

            .

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