Understanding Vision and Refractive Errors

Who was the Roman philosopher that discovered the principle behind glasses?

• Aristotle

• Seneca

• Plato

• Socrates

What is the term for the ability of a transparent medium to change the direction of light?

• Absorption

• Refraction

• Diffraction

• Reflection

Which two main surfaces in the eye are responsible for refraction?

• Iris and Retina

• Cornea and Retina

• Lens and Iris

• Cornea and Lens

What happens when light is focused in front of or behind the retina?

• Clear vision

• Color blindness

• Blurry images

• Double vision

What is the term for short-sightedness?

• Hyperopia

• Myopia

• Astigmatism

• Presbyopia

What is the term for long-sightedness?

• Myopia

• Astigmatism

• Presbyopia

• Hyperopia

What causes astigmatism?

• Non-spherical cornea

• Weak eye muscles

• Flexible lens

• Aging retina

What is the term for the eye's ability to change shape to focus on near objects?

• Refraction

• Accommodation

• Reflection

• Diffraction

What age does presbyopia typically start affecting adults?

• 30 years

• 50 years

• 20 years

• 40 years

What is the most popular method to correct refractive errors today?

• Glasses

• Surgery

• Eye exercises

• Contact lenses