Why do we measure vision up to 20/10, but glasses are prescribed to correct to 20/20?
Автор: Curio Potion
Загружено: 2024-05-25
Просмотров: 404
We measure vision up to 20/10 to determine the upper limits of visual clarity and to ensure that no overcorrection occurs during prescription. While the eye chart includes levels like 20/13.3 and 20/10, glasses are typically prescribed to correct vision to 20/20 because this level ensures that the image is projected precisely on the retina, achieving a state known as "emmetropia." Correcting vision to 20/20 provides a balance that allows clear vision at various distances without causing eye strain or discomfort that might result from overcorrection. Thus, while 20/10 vision is impressive, 20/20 is considered optimal for most people's day-to-day visual needs.
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