How many centimeters is the customary reading distance equivalent to 16 inches?

The customary reading distance is typically around 40 centimeters, which is approximately equivalent to 16 inches. This distance is commonly recommended for optimal visual comfort when reading, as it allows for sufficient accommodation of the eyes and reduces strain.

To further clarify the conversion, 1 inch is approximately equal to 2.54 centimeters. Therefore, when multiplying 16 inches by 2.54, you get about 40.64 centimeters, which is usually rounded to 40 cm for practical purposes in eye care and vision assessments. This distance supports the anatomy and physiology of the eye, allowing for comfortable reading while minimizing fatigue and discomfort during extended periods of focus.

In the options provided, the other measurements would not reflect the standard reading distance typically recommended for adults, as they either exceed or fall short of the conventional 40 cm benchmark.