Understanding Refractive Errors and Glasses

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

• Plato

• Seneca

• Cicero

• Aristotle

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

• Diffraction

• Reflection

• Refraction

• Absorption

What are the two main refractive surfaces of the eye?

• Cornea and Retina

• Lens and Iris

• Lens and Retina

• Cornea and Lens

What is the condition called when light is focused in front of the retina?

• Presbyopia

• Astigmatism

• Myopia

• Hyperopia

What is the term for age-related difficulty in focusing on near objects?

• Hyperopia

• Astigmatism

• Presbyopia

• Myopia

Who developed the modern style of glasses in 1727?

• Edward Scarlett

• Benjamin Franklin

• Galileo Galilei

• Isaac Newton

What is the condition called when the cornea has a non-spherical shape?

• Presbyopia

• Astigmatism

• Hyperopia

• Myopia

What is the process called when the lens changes shape to focus on near objects?

• Diffraction

• Accommodation

• Refraction

• Reflection

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

• Surgery

• Contact lenses

• Eye exercises

• Glasses

How many people are estimated to have problems with close or far vision?

• 200 million

• 1 billion

• 500 million

• 100 million