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So, in summary, it's an entoptic phenomenon secondary to physical deformation of the retina, but also probably because you're affecting the ability of the retina to grab its oxygen supply. Pressure behind eyes when bending, blocked nose, dizzy, when I close my eyes it feels like Im moving, cant sleep. That's because your blood pressure temporarily dips when you stand up and you deprive the photoreceptors of their oxygen supply momentarily, and they respond by firing off these blazes of colours. You may have noticed a similar strange wooziness, but also, you'll have noticed some perhaps funny lights in front of your eyes. You might have also seen this if you stand up quickly out of a hot bath. In fact, the retina has one of the highest metabolic rates of any tissue in the body and if you affect the way at which oxygen moves out of the choroid plexus and into the photoreceptors - for even a fraction of a second - they start to deliver abnormal firing activity, which you see as funny "lights". The choroid plexus is a very dense network of blood vessels. The other thing that pressing on the retina would do is it may affect its ability to pick up oxygen from the blood, because the photoreceptors are right at the back of the eye, close to something called the choroid plexus. One, you deform the retina a little bit and this makes the photoreceptors, which are the specialised rod and cone cells that pick up photons of light, change their pattern of firing activity in response, which is how we see. Gently rubbing closed eyes is one way to experience this phenomenon without injury. When you apply pressure to the retina, two things happen. The retina is stimulated and sends light signals to the brain.