Joshua Silver: Adjustable liquid-filled eyeglasses

The video discusses the global need for vision correction, highlighting that about half of any population requires corrective eyewear. It addresses the shortage of eye care professionals, especially in developing regions, and introduces a solution using adaptive optics for self-adjusting glasses. The speaker shares a vision to provide affordable glasses to a billion people by 2020, emphasizing the need for research and cost reduction.

What percentage of the developed world population is estimated to need vision correction?

• 50%

• 60%

• 70%

• 30%

What is the ratio of optometrists to people in some sub-Saharan African countries?

• 1 optometrist per 1,000 people

• 1 optometrist per 8 million people

• 1 optometrist per 10,000 people

• 1 optometrist per 1 million people

What is the key feature of the self-adjustable glasses introduced by the speaker?

• They can be adjusted by the wearer

• They are disposable

• They are made of recycled materials

• They are solar-powered

How many self-adjustable glasses are currently in use according to the speaker?

• 20,000

• 30,000

• 40,000

• 10,000

What is the speaker's vision for the year 2020 regarding vision correction?

• To make glasses free for everyone

• To provide glasses to 500 million people

• To provide glasses to 1 billion people

• To eliminate the need for glasses

What is the current cost of the self-adjustable glasses mentioned by the speaker?

• $10

• $19

• $30

• $25

What is one of the main challenges in distributing self-adjustable glasses globally?

• Difficulty in fitting the glasses

• Limited internet access

• High production costs

• Lack of interest from the public