I'm having a discussion with an atheist, and have a quick question. 

In discussing direct realism, I've maintained that a person cannot be deceived by his sensory perceptions. Senses report to us, but are not bearers of truth or falsity. Error occurs on the level of judgment. Sense perception can't deceive us.

My friend has pointed out that senses can be defective. He doesn't use this example, but he would probably be talking about a condition like color-blindness. Wouldn't a defective sense faculty lead to a defective, or erroneous perception? 

I want to say yes, but then it seems I'm committed to the view that sensory perception can be in error. Or, should I just say that the senses report what they report, and that the deception would only occur if I judged my perception to be a true picture of the world's colors? 

Thanks in advance for helping.