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Effects of different smartphone screens on tear volume during reading. (a, b) show data presented as median and interquartile ranges; (c, d) show the difference distribution of related detection indexes before and after reading (post–pre = Δ). ***P ≤ 0.001. eInk, electronic ink; NIKTMH, noninvasive keratograph tear meniscus height; OLED, organic light‐emitting diode.
