Hardware

the article failed to mention the major drawbacks of aspheric glass lenses, namely:

• weight

• cost

• massively increased pupil swim to the large population that is bothered by it.

this is why fresnel lenses were universally chosen for the first few sets if devices that weren't cheap insert-phone-vr.

this is why nearly every next-gen device is using pancake lenses.

and the only device (besides this one) that uses something better is vrgineer's xtal with parametrically computed optics... which is one reason those devices run $10k+... a set of these lenses is easily several kilobuck$ to make.

the varjo hmds do tend to use aspheric lenses, but compensate for pupil swim by eye/pupil tracking and adjusting the rendering... something the pimax crystal doesn't do (afaik).