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The pupil of one eye is larger than the other and this condition is observed in a disorder named as Anisocoria. The quantity of light that enters the eye is controlled by the pupil. The pupil narrows down in bright light and dilates in low light. The muscles in the Iris region show some problem in getting dilated and hence lead to Anisocoria.
Answer by Kellycheeseburger10. Confidence votes 86. When a light is shined into an eye the pupil contracts gets smaller because the eye doesn't need all the light being presented to it. If the light is taken away the pupil dilates. PS like the eye gets bigger in the dark.