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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryRetail & CommerceOpticians & Eyewear RetailUsterDiem Optik
Diem Optik Logo
Verified· 4 sourcesTrust Score
Summary

About the company

The core activity of Diem Optik is the consulting and sales of glasses, contact lenses and other optical products, as well as the provision of services in the field of eye optics, including the adjustment and maintenance of visual aids.

AI-generated
Offering

Products & services

Industry:Opticians & Eyewear Retail
✓ Offered5
Glasses
Glasses, shooting glasses and individually fitted frames; plus lenses for everyday life, the workplace and a personal fit.
Progressive lenses
Biometrically made-to-measure progressive lenses, also as B.I.G. EXACT SENSITIVE; with individual measurements for computer screens, reading and everyday use.
Contact lenses
Contact lenses for soft, form-stable and coloured needs; including advice, fitting, myopia control and care products via Lensy.
Sports glasses and sports contact lenses
Sports glasses and contact lenses for sports with a focus on reaction, contrast vision, protection from wind, sunlight and foreign objects.
Dynoptic partner services
Glasses and contact lenses in the Dynoptic network; with knowledge exchange as well as training and continuing education under the Swiss quality label.
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4.1/5

Diem Optik

Trust & reputation

ranQ Trust Score of Diem Optik: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 100% · As of October 2026

Diem Optik scores 77.5 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.83.324%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.63.210%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.78.08%
Diem Optik scores 78.5 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.55.07%
Diem Optik scores 86.7 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).86.722%
Diem Optik scores 22.9 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.45.74%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.0.04%
Qualifications+0.00

Diem Optik reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 11 customer reviews. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 11 reviews across all connected sources

Sources
GGoogle511
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Press

Media

May 13, 2019Media
«Ich bin ein Nachtmensch»
zo-online.ch

Knowledge

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Comparisons

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Location

Freiestrasse 3
8610 Uster
Opening hours
Mon
Closed
Tue
09:00 - 12:00, 13:30 - 18:30
Wed
09:00 - 12:00, 13:30 - 18:30
Thu
09:00 - 12:00, 13:30 - 18:30
Fri
09:00 - 12:00, 13:30 - 18:30
Sat
09:00 - 16:00
Sun
Closed

At a glance

Legal form
Sole proprietorship
UID
CHE-107.156.879
Founded
1999 · 27 years
Last commercial register change
April 6, 2005
Employees
1 to 10
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
67.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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