Gunnar lenses are for general eye fatigue caused by computer screens. They are for the general population. Axon Optics lenses are for photophobia and migraine. They are specifically for those who suffer from these illnesses.
Gunnar lenses will make an environment appear brighter and may reduce eye fatigue, but have not been shown to be effective for those with migraine or light sensitivity. Axon Optics is the only provider that has clinical research linked to the effectiveness of our lens for migraine relief and light sensitivity. You can read more about the studies at http://www.axonoptics.com/migraine-studies/.