Final answer:
The incorrect statement is that the child's corneal diameter is 13, as this value is typically larger than the average corneal diameter for children. Other symptoms listed such as watery eyes, squint, and -1 D myopia are consistent with a pediatric eye examination.
Step-by-step explanation:
The false statement about the child's case is that the child's corneal diameter is 13. While the question does not specify the unit of measurement, a normal corneal diameter is approximately 11.5 to 12 mm in adults, and this value can be a bit smaller in children. A diameter of 13 mm could indicate a condition called megalocornea or could simply be a typo in the question.
All other statements regarding the child presenting with watery eyes, photophobia (avoids light), having a squint, and being -1 D myopic are plausible symptoms and findings in a pediatric eye examination.