Why Squinting Helps You See Clearly: An Ophthalmologist Explains the Pinhole Effect

An ophthalmologist, Dr. Vicki Chan, recently explained the common phenomenon of seeing more clearly by squinting, a trick many people instinctively use when their vision is blurry. In a recent video, Dr. Chan clarified that this action creates what is known as a 'pinhole effect.' 'When you're pulling your eyes, you are squinting,' Dr. Chan stated, 'and this creates a pinhole effect that helps you focus.' She demonstrated this concept using a pinhole occluder, a tool frequently employed by eye doctors during examinations. This device, featuring small holes, functions by blocking out unfocused light rays, allowing only the central, most focused light to pass through to the retina. According to Dr. Chan, this process results in a clearer image, even for individuals with refractive errors. However, she noted a significant drawback: 'Pinhole does cut out light and decrease your peripheral vision.' This limitation means that while the pinhole effect can offer temporary clarity, it is not a practical long-term solution for vision correction, as it severely restricts one's field of view.

Marie Claire Nigeria

2 months ago

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