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> If you're wondering why competitors don't just rely on prescription glasses, it's because your eyesight can actually change over the course of the day. Sound
by jessriedel 2y ago
> If you're wondering why competitors don't just rely on prescription glasses, it's because your eyesight can actually change over the course of the day.
Sounds like this article was written by someone who doesn't know basic optics. You cannot replicate the action of an iris with a choice of lens, no matter how stable your vision is. Lens (to first order) adjust the plane of focus, while irises control the depth of field.
- bongodongobob 2y agoOof. Has nothing to do with the iris. The actual shape of your eye can change throughout the day depending on what you're doing. Your eyeball is just a fluid filled sac.
- HPsquared 2y agoIf you use the iris to widen depth of field, the lens error doesn't matter as much. The limit is the pinhole camera which has no lens at all.
- jessriedel 2y agoYes I am well aware of the basic optics, but the author is not. These headsets come with adjustable lens as well as adjustable irises; if your eye curvature was drifting a bit you’d correct with that. (And if it’s drifting a ton, increasing the depth of field is a poor fix indoors.) The dominant reason to have the iris while shooting is to help you keep three points at different distances in simultaneous focus: the target, far sight, and near sight.
- amelius 2y agoDepth of field can be zero. The target is on a plane.
- jessriedel 2y agoNo it can't, because the shooter is aligning the target with the near sight and the far sight. (I believe they typically focus on the far sight, but the issue arises regardless.)