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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.
The only thing we as clinicians worry about with respect to pupil size is making sure that the two pupils are equal in size and that they are reactive to light. If they are equal in size and reactive to light, this means that the neurological network in the brain that controls the pupils is working properly. As long as someone can see fine, I would not be worried about pupils that are smaller than average.