What is the equivalent myopia degree for 150 degrees of astigmatism?

　　Astigmatism and myopia are very common refractive eye disorders that can lead to decreased visual acuity and blurred vision, thereby affecting ocular health. Some individuals have simple myopia or simple astigmatism alone; however, others suffer from both astigmatism and myopia simultaneously—making the condition more detrimental.

　　How much myopia is equivalent to 150 diopters of astigmatism?

　　150 diopters of astigmatism is roughly equivalent to 75 diopters of myopia. Astigmatism itself is a distinct type of irregular refractive error—not strictly equivalent to myopia or hyperopia. Astigmatism remains a unique condition; however, for estimation purposes, when converting astigmatism to an approximate myopic equivalent, the astigmatic power measured along the 0° or 180° axis may be divided by two—for example, 100 diopters of astigmatism would correspond approximately to 50 diopters of myopic astigmatism. Astigmatism commonly coexists with myopia or hyperopia. Mild astigmatism (≤100 diopters) is extremely prevalent. The astigmatic axis is a critically important parameter: for myopic astigmatism, axes near 0° or 180° exert relatively less impact on vision, whereas axes near 90° produce the greatest effect.

　　Note: Prolonged use of computers or smartphones places significant strain on the eyes. Therefore, screen time should be limited to no more than 1.5 hours per session. After viewing a screen continuously for 1.5 hours, close your eyes for at least five minutes. Alternatively, look into the distance or at green plants to relieve eye fatigue. Individuals who frequently use computers may also benefit from performing eye exercises several times daily to alleviate ocular strain.

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