A district has a total population of 10 lacs, with under 16 population being 30%. The prevalence of blindness is 0.8/1000 among under 16 population. Calculate the total number of blind among under 16 population in the district –

**Core Concept**
Prevalence of blindness is calculated by multiplying the total number of individuals in a population by the prevalence rate. In this case, we need to calculate the total number of blind individuals among the under 16 population.

**Why the Correct Answer is Right**
First, we find the number of individuals under 16, which is 30% of 10 lacs (1,000,000). This is 0.3 * 1,000,000 = 300,000. Next, we calculate the number of blind individuals among the under 16 population by multiplying the prevalence rate (0.8/1000) by the number of individuals under 16 (300,000). Since the prevalence rate is per 1000, we need to convert 300,000 to a fraction with a denominator of 1000. This is 300,000 = 300 * 1000/1000 = 300 * 1000/1000 = 300. Then, we multiply 300 by 0.8 to get 240. Therefore, the total number of blind individuals among the under 16 population is 240.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Option D:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
When calculating the prevalence of blindness, remember to multiply the total number of individuals in the population by the prevalence rate. Also, ensure that the prevalence rate is in the correct units (e.g., per 1000) to avoid errors.

**Correct Answer:** 240.

✓ Correct Answer: A. 240