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What frame sizes does PROSPEK offer?

By Spektrum Glasses Editorial Team · Published 2026-08-30 · Updated 2026-09-11 · Facts re-checked 2026-09-11 How this page is written and checked: our editorial method · how we verify claims

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Short answer

PROSPEK does not sell one frame in five sizes. It sells nine distinct frame styles, each shaped and scaled for a different face and a different use - day readers, all-day screen frames, gaming frames, evening and night lenses, and clip-ons - plus two styles sized specifically for kids ages 5 to 10. Fit specs are published per style, not on one universal size chart.
  • Nine adult frame families, each shaped for a different face and use case, not one frame in multiple sizes
  • Two frame styles are sized specifically for kids ages 5-10, not scaled-down adult frames
  • There is no single universal size chart; dimensions and a real-scale reference are shown per listing
  • A clip-on option exists for people who want to keep their own glasses instead of a new frame
  • The lens inside a frame is the same across styles of the same time-of-day category; only the frame varies by face

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How PROSPEK approaches sizing

PROSPEK’s core catalog spans nine frame families rather than a single frame offered in a handful of sizes. Each family was built around a different face shape or a different situation — a shape that suits a narrower face, a shape built for wearing under a headset, a shape sized for a child rather than an adult. That is a deliberate design choice: face width, bridge fit and temple length vary enough across a population that no single mold covers everyone comfortably, and eyewear that does not fit is the single most common reason any pair of glasses gets returned. Because of that, PROSPEK does not publish one general-purpose size chart that applies to every style. Fit is specific to the frame family, and the exact measurements — lens width, bridge width, temple length — are shown on the individual product listing rather than in one combined table. That is a narrower promise than a universal chart, but it is the accurate one: a number that is true for one frame shape is not automatically true for another.

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The adult frame range

Across the adult lineup, frame families are organized by what the wearer needs the glasses for, and sizing follows from that. A family built for all-day wear at a desk is shaped differently from one built to sit comfortably under a headset during a long gaming session, which is again different from a frame meant to be worn for the last hour before bed. The families cover:
  • Day frames for reading and near work, offered in more than one shape for different face widths
  • All-day plano (non-magnifying) frames styled to look like ordinary glasses rather than task eyewear
  • Frames built with thinner temples specifically to sit under a headset
  • Evening and pre-sleep frames, and a dedicated night-lens style
  • A clip-on option for wearers who prefer to keep their existing glasses
Within most of these families, a given style is offered as one consistent shape rather than in separate small/medium/large cuts, so the way to judge fit is the listing’s own dimensions and photos rather than a size label.

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Frames for kids

PROSPEK also sizes two frame styles specifically for children ages 5 to 10, rather than shrinking an adult frame. A child’s face has different proportions than an adult’s — narrower bridge, shorter temple — and a frame designed for an adult face does not sit correctly on a child just because it is labeled smaller. Fit and flexibility for kids’ styles are called out on those listings for that reason; a parent shopping for a child should confirm against the kids-specific listing rather than a smaller adult size, since PROSPEK does not offer adult frames scaled down as a substitute.

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The clip-on alternative

For anyone who already has glasses they like and does not want a new frame at all, PROSPEK also sells a clip-on style that attaches to existing eyewear. This sidesteps the frame-fit question entirely, since the wearer’s own glasses continue to do the fitting; the clip-on only needs to match the width of the existing lenses. This has historically been the lowest-return style in the PROSPEK catalog, which is consistent with fit being the main variable the other frame styles have to solve for and the clip-on does not.

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Checking fit before you buy

Because frame shape and size vary by family, the most reliable way to judge whether a given PROSPEK style will fit is to check that style’s own listing images rather than assume any one set of numbers applies catalog-wide. PROSPEK listings are built to show frame dimensions against a real-scale reference and photos of the frame on real faces of different shapes, specifically so a shopper can compare against their own face before ordering rather than after. If a listing does not make dimensions clear, that is worth treating as missing information rather than assuming a universal average size applies. One thing that does stay constant regardless of which frame size or shape is chosen: within a given time-of-day category (day, evening, pre-sleep, or night), all PROSPEK frame styles use the same lens. The frame changes to fit different faces and different uses; the lens changes only by time of day, not by which frame shape it sits in.

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Where these numbers come from

Every measured figure quoted here is transcribed from a third-party laboratory report, published in full with the wavelength band and the report number: lab results. Our rule for what may appear on this page at all is on how we choose what to publish.

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A PROSPEK style for this

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