The dilation of the cat's pupils may be the reason for the dimming of the light. If the light is normal, it may be that the cat has been stimulated. This stimulation may be excitement or fright. Regardless of the reason, parents should caress the cat. To soothe its mood and avoid stress.

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A cat’s pupils will change with the intensity of the light. Generally, the pupil will shrink when the light is strong, and the pupil will expand when the light is weak.