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Did I mention how difficult *weight*, *cost*, and *complexity*, and *robustness* are? 😀

Perhaps, just perhaps, there is a *really* low-cost approach, which would facilitate citizen-science in the large, but satisfy all these difficult criteria...

Distractions are difficult! The headset needs to keep the user from distracting light sources and movements beyond the screen. Usually this implies a face hugging VR headset, but (for the reasons below) there simply isn't a true one-size-fits all with that approach.

Lenses are a PITA. They come in all sorts of shapes, sizes, strengths, mountings, and it's not at all obvious (still) which will be most suitable for different types of people. We need a systematically flexible approach which can support different types of lenses.

Phones are difficult. They come in various sizes, and can be HEAVY. To keep costs down, we want to use phones as both the VR screen and sensor platform, but how do we hold it in position?... without scratching it, or risking it falling out and smashing?

Motion sickness in VR is a problem. There is a partial solution --- holding the device with your hands provides an extra point of sensory input which helps your brain keep track of where the real body is, whilst it simultaneously entertains the VR fantasy.

Eyes are difficult. Sometimes they're close together, sometimes they're far apart. Often, they aren't *level*. We need a way to cope with this. We'll cope with different eye strengths by assuming people keep wearing their glasses.

Eye sockets are difficult. Really difficult. The bone along the top protects them, but stops a camera looking down to track eye position. Cheekbones are less pronounced (usually) so the only option is to look up from under the lenses (patents block looking through the lens)

Foreheads. Foreheads are difficult. Some are practically flat, some are pointy, some lean-forwards, some lean-back. My goodness. Foreheads are difficult. Even a cheap design has to cope with this problem.

Noses. Noses are difficult. Some are thin. Some are broad. Some are short. Some are long. Some are big, some are small. Some are straight. Some are bend. Some are hairy... um wait, irrelevant. Even a cheap headset design has to cope with noses across ages and races.

The "low cost" EyeSkills headset kept becoming more complex. Slower to make. More expensive. More fragile. I've taken a break and gone back to first principles, considering what's really necessary? The results have surprised me.