Over 2000 years ago, the Roman philosopher Seneca made an intriguing observation while reading a book through a glass of water. The words on the page appeared magically clear, revealing the power of refraction. Centuries later, glasses were invented, revolutionizing vision correction. Today, millions of people with refractive errors benefit from glasses, which help correct vision by manipulating the direction of light. This passage explores various refractive errors such as myopia, hyperopia, astigmatism, and presbyopia, and highlights the significant role of glasses in restoring clear vision. From Seneca's discovery to the modern precision of personalized glasses, the world of sight has come a long way.

Answer these questions about the video.

1. Who was the Roman philosopher who observed the power of refraction through a glass of water?
a) Seneca
b) Plato
c) Aristotle
d) Socrates

2. Which part of the eye becomes less flexible and leads to presbyopia as we age?
a) Cornea
b) Lens
c) Retina
d) Optic nerve

3. Which refractive error causes objects close up to be unfocused, but distant objects to be clear?
a) Myopia
b) Hyperopia
c) Astigmatism
d) Presbyopia

4. What is the most popular method for correcting refractive errors?
a) Laser surgery
b) Contact lenses
c) Eye exercises
d) Glasses

5. Who developed the modern style of glasses with arms that hook over each ear?
a) Edward Scarlett
b) Seneca
c) Plato
d) Socrates

The answers are in WHITE so please BLACKEN them and you will see them.

1. Answer: a) Seneca

2. Answer: b) Lens

3. Answer: b) Hyperopia

4. Answer: d) Glasses

5. Answer: a) Edward Scarlett