Just give 'em some love.

I don't think there's anything to worry about. His eye is probably just slitted because it hasn't recovered from the bright light. Blast yourself in the eye with a light quickly, then pull it away -- you'll still see the light for a while, so your eye won't dilate properly right away. You may have caused him temporary pain, but he should recover shortly.
If he seems to have trouble seeing tomorrow, tell someone you think something's wrong.

OH ZOMG THANK YOU 

Kuba got tired after a while so I went full-force onto the walls to wake him up. And wouldn't you know it, he turned his head, and the laser hit into his eye. 
When that happened, he stopped and stared at the door like frozen.
I felt more disappointment with him ever possible. Mother was around and didn't pay attention. So I pretended I was investigating Kuba's collar, but actually, I observed his lenses the best I could.

What I could see that the right eye's lenses had a slit.
I feel a bit better now. So I went to check up on Kuba's eyes again. I didn't completely see the slitting light on his lenses, but, i still felt a little uneasy about his sight..