Accommodation is quite important when taking the vision test with the EyeQue miniscope. Since the smartphone will be at such a close distance, your non-testing eye my use it's close up vision if not focused on something far away. Close-up vision tends to be more myopic than your normal distance vision and will cause negatively skewed vision test results. With time and practice, you can greatly improve your ability to minimize accommodation while using the EyeQue miniscope. The most effective way is to keep your resting eye open and look at a target that is at least 6 feet away while testing your other eye. You also want to relax your eyes as much as possible when testing. Taking the test in a darkened environment will help immensely in relaxing your eyes while taking the test.