You may not need to wear glasses when using a VR headset if you have decent eyesight, or if you are farsighted. However, if you are nearsighted (or worse than 20/80), you may need to wear glasses to see clearly about 2-3 meters in VR.
Nearsighted vision (myopia) is a condition when you can see objects near to you clearly, but objects farther away are blurry. A VR headset uses a lens to display images at a long distance from the eye like the slide viewer.
The human brain can judge the distance between objects by perspective and angle. Since each eye sees a different perspective, and when the two images are combined it gives the user the 3D effect.
The 3D images in VR can definitely provide this type of visual stimuli to the user. However, current virtual reality headsets don't feature foveated rendering technology to simulate visual depth perception.
Based on this information, bifocal lens for VR headset may not be necessary.
Try VR Prescription Lenses
If you're seeing fuzzy images inside the VR goggle even when using a high-definition headset, you may want to wear glasses. However, most users wearing glasses don't feel comfortable inside the goggle because they can be too tight.
We recommend buying a pair of VR prescription lenses that can fit right on the headset and ditch the glasses when using VR.
Check out the 4 options you can buy here
If you have 20/20 vision, that alone doesn't guarantee high resolution inside the VR goggle. While virtual reality can offer an immersive experience, the current technology still has limitations as far as displaying higher resolution, as much as 12K - 16K resolution.
A game may look sharp on a 34" monitor on max graphics setting, but it may look blurry in VR, because it's scaled and needs to fill in more details to make it immersive.
So this may explain why 360 VR videos are low quality, and it's not your fault.