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My understanding and experience is that during the night photoreceptors are less tightly coupled to the retinal pigment epithelium. Does this make it more likely for a retinal detachment to happen at night?

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In case of normal, healthy person, no, I don't think so. In fact, retinal detachment could happen at anytime of the day. Main causes are diseases and illness, such as AIDS, diabetic retinopathy, cancer, or trauma such as post-cataract surgery and being hit/kicked hard on the eyes.

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