When I was working in a biomedical engineering ophthalmology lab, they used these little plastic shoes to attach to the eyeball one by one and then insert into a machine to stretch it and take pictures to simulate accommodation (looking at things up close). The machine was called evas, ex-vivo accomodation simulator. However, sometimes the force would be unequal and would tear because of human error putting the shoes on. I designed and built out of pmma a device that looked like a microsocope but used two shutters in an eye piece to align the pupil+iris perfectly with the shoes. You would use screws to manipulate the angle of the eye on the bottom and then once everything was good, slide down the shoes and bam. 100% accuracy each time
What's the weirdest thing you've ever eaten?