Myopia Can Be Corrected with Artificial Lenses or Surgery and Is

question 51

Multiple Choice

Myopia can be corrected with artificial lenses or surgery and is generally regarded as a benign disorder. However, as myopia is also associated with more severe conditions such as cataracts and glaucoma, a change in the prevalence of myopia (proportion of the population with myopia) may be a public health concern. The graph shows the change in the prevalence of myopia in three major ethnic groups in Singapore at three points in time.
Source: Adapted from Morgan, I.G., Ohno-Matsui, K., and Saw, S. M. (2012) . Myopia. Lancet, 379: 1739-1748.
-What anatomical changes do you expect to accompany the change in prevalence of myopia?

• A) a greater proportion of the population with longer-than-normal eyeballs
• B) a greater proportion of the population with difficulty focusing on close objects
• C) a greater proportion of the population with misshapen corneas
• D) a greater proportion of the population with abnormally high pressure in their eyes

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Definitions:

Thrombocytes

Also known as platelets, these are tiny blood cells that play a crucial role in blood clotting, helping prevent excessive bleeding when vessels are injured.

Erythrocytes

Red blood cells, which are responsible for carrying oxygen from the lungs to the body's tissues and returning carbon dioxide from the tissues back to the lungs.

Hct

Hematocrit; a measure of the proportion of blood volume that is occupied by red blood cells, typically expressed as a percentage.

HCT

Hematocrit, a measure of the proportion of blood volume that is occupied by red blood cells.