If prolonged viewing of DSE is needed, it is recommended to alleviate eyestrain by following the 20-20-20 rule, which is

要紓緩因持續使用顯示屏幕設備引致的眼睛疲倦，可遵循20-20-20法則，即是：

Question

If prolonged viewing of DSE is needed, it is recommended to alleviate eyestrain by following the 20-20-20 rule, which is

要紓緩因持續使用顯示屏幕設備引致的眼睛疲倦，可遵循20-20-20法則，即是：

BlackTom AI · Accepted Answer

The question concerns the 20-20-20 rule for reducing eyestrain from prolonged screen use, and it provides both an English description and a Chinese translation of the concept.
Since the answer options are not provided in the data (answer_options is null), I will focus on explaining the standard 20-20-20 rule and why the typical correct choice aligns with this rule, while also noting the absence of alternative options to compare.
Standard explanation: The 20-20-20 rule recommends that for every 20 minutes of looking at a screen, you should take a break and look at something at least 20 feet away for at least 20 seconds. This practice helps relax the eye muscles, reduces focusing strain, and can alleviate symptoms of digital eyestrain such as dryness, irritation, and blurred vision.
Why this is correct: The rule is a practical guideline designed to reduce accommodative and vergence fatigue by periodically shifting the eyes from a near focal distance (the screen) to a distant target. The 20-second duration is long enough to allow the ciliary muscles to relax, and the 20-foot distance corresponds to a far enough target to reduce sustained accommodation.
Why other options would be incorrect if they existed: If an option suggested shorter breaks (e.g., 5 or 10 seconds), it would not provide sufficient relaxation of the focusing muscles over time. If an option used a different distance (e.g., 10 feet) or different interval (e.g., every 30 minutes), it would diverge from the widely recommended standard and could reduce effectiveness. If an option claimed the rule only applies to certain populations or all screens, it would misstate the general guidance, which is intended for general screen use across most contexts. However, since no alternative options are provided here, these are hypothetical reasons one would evaluate.
In summary, the provided English statement and its corresponding Chinese translation correctly reflect the conventional 20-20-20 guidance: every 20 minutes of screen time, look at something at least 20 feet away for at least 20 seconds.

If prolonged viewing of DSE is needed, it is recommended to alleviate eyestrain by following the 20-20-20 rule, which is 要紓緩因持續使用顯示屏幕設備引致的眼睛疲倦，可遵循20-20-20法則，即是：单项选择题

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