Children can and need to be taught to wait for their eyes to adjust to changes in lighting. This is most true if going from outdoors to indoors and visa versa. Children can learn to view in different ways to maximize their residual vision. The most obvious is distance. Getting closer to or farther away from the object or person to be seen may make it easier.
Some children tilt their heads to get the visual material at an ideal angle.
They may also do this by moving the material. Lighting interacts with many other factors but most importantly with contrast. Lighting can increase or decrease the contrast of visual materials. In a dark environment increased lighting will increase contrast but in a bright environment it will reduce it. Natural light is good but it needs to be controlled due to glare.