A 3-year-old child is brought by parents complaining of noticing squinting in the right eye of the child since the last 6 months. You observe a right eye 30 degrees convergent squint. You then perform a dilated fundus examination to rule out any retinal pathologies as well as do a cycloplegic retinoscopy, which reveals a hypermetropic refractive error. Appropriate unifocal glasses are prescribed for this child. On the first follow-up visit, you notice that there is no squint with the glasses on, and the parents are happy, but they want to know the cause of the squinting eyes. Your explanation to the parents would be the squint was due to:
a) Uncorrected myopia
b) Uncorrected hypermetropia
c) Astigmatism
d) Amblyopia