Sunglasses will make your eyes more sensitive to outdoor light
Do you squint outdoors on bright, sunny days? Join the club. Wear sunglasses, problem solved. But not if you’re having a portrait sitting. Everyone knows that if you walk from the light into the dark, your eyes need some time to adjust. Well, the converse is also true. When you go outside into bright light, your eyes are temporarily overwhelmed and squint or tear up while adapting to the change.
Compensate by letting your eyes adjust to the light for 30 minutes
Here are my eye-opening methods for reducing squinting; they may seem counter-intuitive at first. Most importantly, don’t wear sunglasses for at least 30 minutes before your outdoor sitting so your eyes have a chance to adjust to the light. Under the harshest lighting conditions, such as at the beach or on a boat, wearing a dark-colored shirt may have a calming effect on your eyes. If squinting persists, look up into the bright sky (but never at the sun!), adding momentary strain, and your eyes will react by relaxing when you look back down toward my poised camera.