The system of claim 1, wherein at least said first content comprises varying visuals provided to said user via a display on said mobile device.
3. The system of claim 2, wherein said at least one sensor comprises at least one camera on said mobile device.
4. The system of claim 3, wherein said at least one camera on said mobile device is used to capture changes in said user's pupil from a dilated state in response to changes from a first visual to a second visual provided by said display on said mobile device.
5. The system of claim 1, wherein said emotional state comprises at least one of happiness, sadness, surprise, anger, disgust, fear, euphoria, attraction, love, arousal, calmness, amusement, excitement, tiredness, hunger, thirst, well-being, sick, failure, triumph, interest, enthusiasm, animation, reinvigoration, and satisfaction.

As the 2010s have been dubbed “the decade of the smartphone”, it’s no surprise that extensive research has been conducted in this area. One finding which seems to be mentioned everywhere is “blue light”. This is the light which is emitted from our phones, tablets and laptops and, sadly, it has been found to have negative effects on our eye health. Studies suggest that it has “a potential to lead to macular degeneration”, bypassing the pupil and cornea to beam directly into the retina