I don't know if it is related to any health problems, so i'm sorry I can't help you there.
In regards to the first picture, mind you it is only my opinion, I feel that Reebok's eyes are just adjusting to the flash of the camera.
Also, cat's eyes do not dilate when they are in sunlight anyway, so you have nothing to worry about there.

If you are concerned about this, maybe you can have your vet check his eyes out to put your mind at ease.