By age 20, approximately __________% of the population is myopic.

By age 20, approximately __________% of the population is myopic.

• A. 10%
• B. 20%
• C. 30%
• D. 40%

Answer: (B)

Myopia prevalence in early adulthood reflects that refractive errors commonly develop during school years and then stabilize around the late teens to early twenties. By age 20, roughly one in five people is myopic in many general populations, making twenty percent a reasonable and commonly cited value. This estimate is a general guideline; actual prevalence varies by ethnicity, geographic region, and measurement criteria, with some populations showing higher rates and others lower. The important concept is that the proportion is on the order of a few tens of percent, not very high or very low, and twenty percent is a well-supported ballpark for this age group.

Myopia prevalence in early adulthood reflects that refractive errors commonly develop during school years and then stabilize around the late teens to early twenties. By age 20, roughly one in five people is myopic in many general populations, making twenty percent a reasonable and commonly cited value. This estimate is a general guideline; actual prevalence varies by ethnicity, geographic region, and measurement criteria, with some populations showing higher rates and others lower. The important concept is that the proportion is on the order of a few tens of percent, not very high or very low, and twenty percent is a well-supported ballpark for this age group.