I believed in Visual Stimulation Flashcards, in fact, I made my own version last year and selling it in the market. You use the flashcards during your babies' waking hours. Show the flashcard from the right side of his vision to the left, then up and down. Observe the movements of his eyes. If you see that he's eyes are not following the flashcards, you might want to see an eye doctor. Stimulating your babies' vision will improve their focus. My baby is almost 3yrs old now, I used it during her first 6mos. Now she is very curious and a keen observer.