Your eyes, sensing the lack of light, have gone into dark-adapting mode – your pupils grow to let in more light and then the all-important chemical changes begin to switch on the low-light-intensity ‘rods’ which fill the backs of the eyes, so you can see more.
Your eyes, sensing the lack of light, have gone into dark-adapting mode – your pupils grow to let in more light and then the all-important chemical changes begin to switch on the low-light-intensity ‘rods’ which fill the backs of the eyes, so you can see more. For more on this, read our guide to averted vision.