Eye Accessing can be tricky business.  To use eye accessing techniques to determine if someone is being deceptive you must be studied and practiced.  To determine someone's truthfulness based on eye accessing alone can be dangerous. We can't stress enough the importance of evaluating clusters of behavior and weighing those behaviors against a person's baseline.  What is normal for your subject?  That is their baseline.  Even to determine someone's baseline, you need some training and practice.
Most people are visual and most visual people look up and to their left when they are accessing memories.   But if that same someone is lying to you and their story is rehearsed, they will look up and to their left as well.  Think about it.  If you've rehearsed a story, memorized it, then when you try to recite it....you will draw from memory.
Although not common, there are visual people who look up and to their right when they are recalling memories.  Again, we emphasize the importance of baselining. 
So, if most visual people look up and to their left when recalling a memory (telling the truth), then it makes sense that most visual people will look up and to their right when they are constructing (lying).   Be advised that if you ask your subject to imagine some scenario, they will also look up and to their right.  Also, most people will look to their right if they are trying to recall numbers. 
But what if your subject is predominantly auditory, a hearing dominant person?  Most auditory people will look laterally and to their left when accessing memories.  If you've baselined your subject and they look laterally and to their left when answering a question with no consequence to the answer, they will look to their right when they are lying to you.
Accessing Emotions
We all look down when accessing emotional memories, usually to our right.  And all of us look down and to the left when we're involved in internal dialogue.  In other words, when you are talking to yourself in your head.  If you've asked your subject a question and they look down and to their left, they are probably considering how to best answer your question.
Check out this diagram: Eye Accessomg Diagram It may help you.  Remember, the depictions would apply for most but NOT for all people.  Baseline.  Baseline.  Baseline.
We have a lot of power, you know?  The power to change a person's life forever.  So make every effort to evaluate accurately.  
The little bit of information on this page is NOT enough to qualify you to determine someone's honesty by assessing their eye movements in response to your questions.  Use this information as a tool or to reinforce the training that you have had. 
Eye accessing is a technique that you can use in concert with your other investigative skills to determine if someone is being deceptive.
Athena Training Solutions teaches eye accessing in conjunction with advanced body language techniques training.  Eye accessing is a component of the Liar Liar Face on Fire curriculum.