Ranjit, a four-year-old boy, has been complaining of dry eyes and poor night vision for the past six months.

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Dr Paul Muthiah is a GP on the Central Coast , NSW, and medical co-editor at Australian Doctor.

Reproduced from Abbas A, Firdaus U. Arch Dis Child Educ Pract Ed 2019; 104:99-100, with permission from BMJ Publishing Group Ltd.