Why should the VR head display be equipped with a lens? Do you know these principles?
In the cold winter of capital, the VR industry began to show explosive growth, and more users chose to join the VR experience. To understand VR, first start with the working principle of VR. Today’s Xiaobian will give you a brief introduction.
From human vision to VR application
The eye has a lens behind the pupil and a sensory organ on the back, which can convert the incident light into useful visual information.
The lens refracts light into the sensory organs. The lens curvature depends on the distance between the eye and the object. If the object is close, the lens needs to bend sharply to present a clear image. If the object is far away, the lens only needs to bend slightly.
With age, the lens loses its elasticity and its ability to refract light becomes worse. This is why teenagers can see objects close to 7cm, while the elderly can’t.
Therefore, it is not easy to see things in the head display 3-7cm away from our eyes. This is the role of virtual reality lens.
Why should the head display be equipped with a lens?
The head display needs a lens to correct the angle of the light source of the lens and be read by the human eye again.
When the eyes look at the distance, the fixation point is infinite, the light is parallel, and the lens is at rest. If an object is close to your eyes like a small fly and you have to look at it all the time, the lens will bend and the parallel state of light will be broken.
If you want to look at the fly all the time, all the single light from the fly needs to focus on one point of the eye. If the fly gets too close, the lens is not flexible enough to bend, and the eye loses focus.
When the light beam hits the lens from different angles, it will feel that the distance between the eyes and things is far, but in fact, the distance is not so far.
At present, there is no perfect way to choose the lens.
Using a lens with fewer threads helps focus the beam and improve contrast, but the clarity of the image will be damaged.
A multi threaded lens can see a clearer image, but the light cannot focus on one point, and the curvature is always incorrect.