As we know that "Our eyes need sunlight. We shouldn't avoid being in the sun.", "Sunlight exposure does a lot of good things for our bodies — like driving melatonin production — and is important for the sleep cycle. But we just don't want too much of a good thing.", so remember that the key is "balance".
There is a lot of research that shows the harmful effects of too much sunlight for a child's eyes, sunlight overexposure can lead to aging of the lens and retina damage. Children with fair skin tend to have lighter-colored eyes and are more vulnerable to too much sun exposure, while parents should take caution with every little looker's sun exposure.