Guestimate Question : How many people are there wearing spectacles in Delhi?

Question

Accepted Answer

It is difficult to accurately estimate the number of people wearing spectacles in Delhi without specific data.

Population of Delhi is around 20 million, so a rough estimate could be based on the global average of 25% of the population wearing spectacles.
Factors such as age demographics, income levels, and access to healthcare facilities can also influence the number of people wearing spectacles.
Survey data or market research reports on eyewear usage in Delhi could provide more accurate estimates.

Accepted Answer

The goal here is to showcase thought process and logical thinkging so let's break it down.

1. SCOPE: Are we considering all kinds of spectacles or only correctional and reading glasses? Are we to consider all age groups?

2. BREAKDOWN APPROACH
Estimate the total population, segment by age groups and estimate the proportion of people in each group that wear spectacles:

2.1. Calculation
Population  aprox. = 20 M
Age Segmentation:

0-14 years (20% of the population):
~4 million people
→ Assume 10% wear spectacles (for vision correction or school-related issues)
→ 0.4 million (400,000) people wear glasses

15-44 years (50% of the population):
~10 million people
→ Assume 30% wear glasses (including myopia and working professionals using computers)
→ 3 million people wear glasses

45+ years (30% of the population):
~6 million people
→ Assume 50% wear spectacles (for presbyopia and other age-related vision problems)
→ 3 million people wear glasses

Total people wearing spectacles = 6.4 million

3. CLOSING STATEMENT
Aprox. 6-7M people wear glasses in Delhi considering a population of 20M people, divided by age groups.
Proportions may however vary depending on factors like education, profession, urban vs. rural population, aging.

Guestimate Question : How many people are there wearing spectacles in Delhi?

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