A ring layout fits the shape of the field of view better than a rectangle

What it is

After two eyes and two lenses, what a person can actually see is closer to a cropped circle or ellipse than to the panel rectangle. Bring a desktop’s four-corner panel into a headset and the corners land either outside vision or on the optically worst diagonals, while the mid-left and mid-right stay empty. An annular HUD layout places elements along an iso-eccentric line of the usable field, so each item shares roughly the same angular distance from centre — not the same pixel distance from a rectangular frame.

Why it happens

A rectangle’s four corners are the most eccentric; the top and bottom edges next; the left and right edges sit further in, because horizontal field is usually wider than vertical. Desktop habit parks status in corners, which here means parking it at the four least usable points. A ring at constant eccentricity gives every item the same head-turn cost and the same optical-quality band, and the scan path is closer to a natural circular search than to a polyline around a box. A rectangle also says “this is a screen” and pulls the spatial UI back toward a 2D window; a ring is closer to a helmet reticle or a cockpit’s circumferential instruments, and matches the body geometry of a head at the centre.

Studying it

The same set of status icons, compared in three placements — rectangle corners, rectangle edges, a ring — with a spoken name as the search target.

Independent variables: layout topology (corners / edges / ring), ring radius, icon count. Dependent variables: search time, total head-motion amplitude, misses, a rating of “is it in the view”.

Eye–head heatmaps show whether rectangle corners sit in a diagonal zone that is never fixated. Horizontal-to-vertical field ratio differs by headset, so the ring’s aspect must be measured per device; a perfect circle is not universal.

Where it stops holding

Tables, documents, and keyboards are rectangular as information; forcing them onto a ring wrecks rows and columns. A large world-locked panel that faces the user is still better as a rectangle. The ring is for circumferential status that travels with head or body, not for every surface. With only two or three icons the ring looks sparse; a tight cluster in the lower comfort band beats symmetry. On a headset with a very short vertical field the top and bottom of the ring hit optical falloff first, and the ring should flatten into two side arcs rather than a circle.

Applying it

• Place standing status, tools, and presence cues on an iso-eccentric arc. Do not default them into corners.
• Draw the usable horizontal and vertical field on the target headset and let the ring’s flatten follow that ellipse, not the artboard.
• Cluster by task frequency: high-frequency items near the lower midline, low-frequency items to the sides. Do not send frequent items straight up for symmetry — looking up costs more than looking level.
• How to check: wear it without turning the head and count how many icons can be named in one glance. If corner items are named clearly less often than ring items at the same radius, the rectangle has not met the field.

Related

• Same group: N3.07.1 Edge content needs a head turn to be seen clearly · N3.07.2 Critical information must not sit at the edge · N3.07.3 The edge is fit for presence cues · N3.07.4 Pull edge elements inward to leave margin for optical falloff · N3.07.6 Content outside the binocular overlap is seen by only one eye · N3.07.7 Elements that enter and leave the view with head motion need hysteresis or they flicker
• Nearby: N1.03 Field of View · N3.04 Text Readability in 3D Space
• Search terms: annular HUD · circular layout · HMD field shape