Aster and Theory: Two New Acetate Shapes, Ten Days Apart

Two frames went live within ten days of each other, and they are the same material cut two different ways: Aster, a 142 mm square with a 54 mm lens, and Theory, a 144 mm round with a 50 mm lens and a 23 mm keyhole bridge. Same acetate, same 41–42 mm lens height, entirely different result on a face.

That is the part worth writing about. A square and a round frame with nearly identical measurements still behave differently, because the square keeps its width at the corners and the round spends it in the middle. If you are choosing your first pair of acetate glasses, this is the comparison to make before you look at colour. Both shapes are on the new arrivals page, along with the rest of this month's frames.

What the two shapes share

Both are full-rim acetate, both hold roughly 41 to 42 mm of lens height, and both sit at the medium end of the fit range. That last point is not incidental: 41 mm is enough vertical room for a progressive lens to keep a usable reading zone at the bottom, which is not true of every frame in this width class. If you are moving from single vision to progressive, either shape will take it without forcing you into a deeper frame.

The other shared feature is the construction. Neither frame is a thin rim with a lens dropped in; the acetate is thick enough at the corner to hold the lens without a visible edge, which is what makes a strong prescription look ordinary. Single vision versus progressive covers when that matters, and our progressive lenses lists what the frames will accept.

The four frames

Square · Black Aster-FC01 Square acetate front at 142 mm with a 54 mm lens and stud accents at the corners. Front 142 mm · Lens 54 mm × 41 mm · Bridge 17 mm · Temple 145 mm Shop Aster-FC01	Square · tortoise Aster-FC04 Aster in tortoise, with the same stud detail and 41 mm lens height. Front 142 mm · Lens 54 mm × 41 mm · Bridge 17 mm · Temple 145 mm Shop Aster-FC04
Round · Black Theory-FL01 Round acetate with a 23 mm keyhole bridge and a 144 mm front. Front 144 mm · Lens 50 mm × 42 mm · Bridge 23 mm · Temple 145 mm Shop Theory-FL01	Round · Clear Theory-FL02 Theory in clear, with the same 50 mm lens and keyhole bridge. Front 144 mm · Lens 50 mm × 42 mm · Bridge 23 mm · Temple 145 mm Shop Theory-FL02

Where a square and a round actually differ

A square frame puts material at the four corners. That does three things: it makes the frame look wider than its measurement, it holds a lens with more edge thickness more securely, and it draws a horizontal line across the face at brow height. If your face is long or narrow, those three things work in your favour — the horizontal line breaks the length.

A round frame puts its width at the centre and nothing at the corners. That makes it look narrower than its measurement, gives you the least possible material in peripheral vision, and draws no horizontal line at all. On a round or square face it softens the jaw; on a very narrow face it can make the eyes look further apart, which is either the point or the problem.

The 17 mm versus 23 mm bridge is the real decision

Everything about these two frames is close except the bridge, and the bridge is what decides whether a pair sits correctly. Aster's 17 mm bridge is on the narrow side, which suits a narrower nose and holds the frame higher. Theory's 23 mm keyhole bridge leaves a gap over the nose instead — it distributes contact to the sides and lets the frame sit slightly lower, which is why it works on a wider bridge and why it will not slide forward on a low one. Nose marks and bridge fit explains the difference in contact points.

If you have worn glasses for years and never thought about bridge width, check the pair you own: the number is usually printed on the inside of the temple, second figure in the sequence. 17 to 19 mm is common; 23 mm is wide. Ordering a 23 mm bridge when you need a 17 mm one is the single most common reason a correctly sized frame feels wrong.

Colour, once the shape is settled

Aster comes in black and in tortoise, and the stud accents at the corners are the same on both — which means colour does all the work. Black reads more formal and holds a hard line against the face; tortoise reads warmer and picks up the light through the material. Theory comes in black, clear, grey and blue, and the clear version is the one that changes the frame most: at 144 mm it stops looking like a frame at all and starts looking like the shape of your face.

If you want to stay within one shape while you choose, the square eyeglasses and round eyeglasses collections hold the wider catalogue, and acetate eyeglasses cuts across both by material. The women's eyeglasses page is where the clear and blue finishes are grouped.

Ordering either one

1. Measure a pair that fits you hinge to hinge — 142 mm for Aster, 144 mm for Theory.
2. Read the bridge width off the inside of that temple and compare it with 17 mm or 23 mm.
3. Confirm your pupillary distance against the lens width, not the frame width.
4. If you wear a progressive, keep the 41–42 mm lens height in mind when choosing the reading position.

Step one is diagrammed on frame measurement, step three on pupillary distance, and how to measure a frame you own covers where to find the numbers on an existing pair.

What 54 mm and 50 mm lens sizes do to a prescription

The two frames differ by 4 mm of lens width as well as 6 mm of bridge, and 4 mm is the number that shows up in a prescription. Lens thickness at the edge grows with lens size, so a −4.00 in Aster's 54 mm lens will be visibly heavier at the corner than the same prescription in Theory's 50 mm lens. On a moderate prescription that difference is invisible; on a strong one it is the difference between a frame that looks normal and one that looks like it is doing some work.

The material choice closes part of that gap. A 1.67 index lens in the wider frame will end up thinner than a standard index lens in the narrower one, which is why the order of decisions matters: frame first for fit and shape, lens index second for thickness. High-index lenses sets out the steps, and how to choose lenses covers what is available at checkout for either frame.

Everything else that arrived this month is on the eyeglasses page, sorted with the rest of the catalogue rather than by arrival.