If light enters the pupil through the edge to reach the retina, does that light appear brighter or dimmer?

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Multiple Choice

If light enters the pupil through the edge to reach the retina, does that light appear brighter or dimmer?

Explanation:
The brightness you perceive depends on how much light actually reaches the retina through the pupil. When light hits near the edge, the iris rim blocks part of the beam, so fewer photons get through to the retina. With less light detected by the photoreceptors, the image looks dimmer than light that passes more centrally through the pupil. In short, edge-entry light is partially occluded, reducing the retina’s illumination and making it appear dimmer.

The brightness you perceive depends on how much light actually reaches the retina through the pupil. When light hits near the edge, the iris rim blocks part of the beam, so fewer photons get through to the retina. With less light detected by the photoreceptors, the image looks dimmer than light that passes more centrally through the pupil. In short, edge-entry light is partially occluded, reducing the retina’s illumination and making it appear dimmer.

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