Vision Defects & Treatments

What is myopia?

Short-sightedness, where distant objects appear blurred.

What causes myopia?

Light from distant objects is focused in front of the retina.

What can cause myopia?

An eyeball that is too long or a lens/cornea that refracts light too strongly.

What type of lens corrects myopia?

A concave (diverging) lens.

How does a concave lens correct myopia?

It diverges incoming light so the eye focuses it on the retina.

What is hyperopia?

Long-sightedness, where nearby objects appear blurred.

What causes hyperopia?

Light from near objects would be focused behind the retina.

What can cause hyperopia?

An eyeball that is too short or a lens/cornea that does not refract light strongly enough.

What type of lens corrects hyperopia?

A convex (converging) lens.

How does a convex lens correct hyperopia?

It converges incoming light so the eye focuses it on the retina.

What is the difference between myopia and hyperopia?

Myopia affects distance vision, whereas hyperopia affects near vision.

How can glasses correct vision defects?

They use corrective lenses to refract light so it focuses on the retina.

How can contact lenses correct vision defects?

They alter the refraction of incoming light, allowing a clear image to form on the retina.

How can laser eye surgery correct some vision defects?

It reshapes the cornea to change how light is refracted.

What is a replacement lens used for?

To replace the eye's natural lens and improve focusing in suitable cases.

What is one advantage of glasses?

They provide non-surgical vision correction.

What is one disadvantage of contact lenses?

They require careful hygiene to reduce the risk of eye infections.

What is one risk of laser eye surgery?

Possible infection, dry eyes or unwanted changes in vision.

Why might different patients require different vision treatments?

The best treatment depends on the type and severity of the defect and individual circumstances.