Final answer:
Preschoolers are at a higher risk of developmental delays when under-stimulated, as sensory input is crucial for neural development. Vision problems like nearsightedness typically emerge later in childhood but can also lead to developmental issues if not addressed.
Step-by-step explanation:
Preschoolers may experience developmental delays if they are under stimulated. Sufficient stimulation is crucial for the development of neural connections. Studies, such as those involving kittens, have shown that without adequate sensory input during critical periods, the necessary neural connections may not develop properly, impacting vision and other areas of development. In contrast, it is less common for preschoolers to experience issues with nearsightedness or far-sightedness; these vision problems typically arise in school-age children. If a child does display vision problems, it could significantly affect their learning abilities and potentially lead to developmental delays. Addressing any sensory deficits early is essential for promoting healthy development and preventing future learning challenges.