Have you noticed that your vision is slightly blurrier at night than during the day? You are not imaging it - this phenomenon is called night time myopia.
This phenomenon was first described by astronomers who noticed a need to add lenses with more negative power or myopia correction when viewing stars at night.
Why are we more nearsighted at night?There are a few optical reasons causing this phenomenon.
1️⃣ At night our pupils are larger in dim light, and any nearsightedness that is not corrected with glasses or contact lenses (under-corrected myopia) will become more noticeable.
2️⃣ With larger pupils at night, the spherical aberration(SA) of our eyes increases, and we have to focus our eyes more (increases accommodation and nearsightedness) to see clearly.
3️⃣ At night, more point light sources are seen, and there is greater contrast, both of which increase aberration and night time nearsightedness. In order to see more clearly, our eyes have to accommodate more, which increases myopia (nearsightedness).
So next time, when you notice your vision is not quite as sharp at night as during the day, you’ll know why.
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