Blue eyes are often used to convey innocence, naivete, and purity of soul. In his short story “The Rocking-Horse Winner,” D. H. Lawrence refers to Paul's blue eyes on a number of occasions as a way of driving home what kind of person he is and how naive and innocent he is concerning the ways of the world.

Paul's blue eyes also act as windows to his soul, which is pure, untainted as it is by the grasping materialism of his mother, Hester. As with a number of male characters in the works of D. H. Lawrence, Paul desperately wants to please his mother, which is why he regularly hops aboard the rocking-horse to find out the winner of the next big race. When he does so, his blue eyes are described as “fierce” and set close together as they stare straight ahead.

It's notable that not long before Paul tragically passes away after falling off of the rocking-horse, his eyes are described as resembling “blue stones.” This would appear to indicate that, despite everything he's been through and despite all the money that he's made for his insatiable mother, Paul has managed to retain his innocence. His innocence, represented by his blue eyes, has been preserved, which is why his eyes have a stone-like quality about them.