AR Glasses FOV Calculator
Spec sheets list field of view and resolution in separate paragraphs nobody cross-references. Enter the numbers for two headsets and see which one shows a wider view and which one shows a sharper image. Nothing uploaded.
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Field of view, pixels per degree, and AR headset specs
Understanding field of view vs pixels per degree
Field of view (FOV) is the horizontal degrees of your vision the display covers - wider means you see more of your surroundings while viewing the overlay. Pixels per degree (PPD) is display resolution divided by FOV degrees - higher PPD means a sharper image. These two metrics almost always trade off. A narrow 50-degree display with 1920px resolution yields 38 PPD (very sharp text). The same 1920px spread over 100 degrees yields only 19 PPD (fuzzy). Most AR glasses deliver 20-40 PPD, which is noticeably soft compared to smartphone screens (400+ PPD) but acceptable for user interface elements and navigation overlays.
Balancing FOV width and image sharpness
Choose FOV and PPD based on your use case. For reading text, watching videos, or detailed work: prioritize PPD. A 50-degree FOV at 40 PPD (text-readable) beats 90 degrees at 15 PPD (fuzzy text). For gaming, situational awareness, or contextual overlays: prioritize FOV width so you can see game action or navigation hints without moving your eyes too much. Most developers find 60-80 degrees FOV with 25+ PPD covers both text-heavy and visual tasks reasonably well. Note that perceived sharpness also depends on viewing distance and individual eyesight - test headsets before buying.
FAQ
What FOV is considered good for AR glasses?
The human eye's horizontal field of view is about 210 degrees. Most current AR glasses range 40-90 degrees - narrow enough that you see the display as a rectangular window, not filling your whole vision. Apple Vision Pro at 110 degrees is notably wider. Above 100 degrees, you start to approach a more immersive feel. Below 40 degrees, the display feels cramped and you lose a lot of context.
What's a good pixels-per-degree value?
Higher PPD means a sharper image. Human visual acuity at arm's length can distinguish about 60 PPD. Most current AR glasses deliver 20-40 PPD - noticeably fuzzy compared to smartphone screens (400+ PPD). Apple Vision Pro at ~30 PPD is roughly mid-range. Below 15 PPD, text becomes hard to read. Above 50 PPD, the image looks crisp and nearly photographic.
Should I prioritize wider FOV or sharper pixels?
It depends on the use case. For reading text or detailed work, prioritize PPD (sharpness) - a 50 degree FOV with 40 PPD beats 80 degrees at 15 PPD. For gaming or contextual overlays (navigation, notifications), prioritize FOV (width) - wider lets you see more environment while viewing the overlay. Most users find a balance: 60-80 degree FOV with 25+ PPD covers most needs.