Conditions that cause sensitivity to light or other atmospheric conditions
Sensitivity to atmospheric conditions can come in many forms. If sensitivity to light is a concern try dimming lights to a level that is comfortable, while still allowing yourself and other players to read through materials. If this needs to be accommodated by desk lamps or book lights it can help create more personalized lighting and even improve on the atmosphere built into certain adventures.
For other conditions, communicate the needs of the player with the players caregiver and try to accommodate the needs as best you can within the environment while still allowing for comfortable play of others at the table.