Jaeger J1
Jaeger J1 is the smallest standard near-vision test letter size (corresponding to approximately 20/20 vision at 30 cm), the typical minimum acuity required for NDT personnel by most certification standards.
Definition
Jaeger numbers J1 through J16 describe progressively larger test letters. J1 is the smallest. Most NDT certifications require J1 or J2 with one or both eyes corrected.
How the scheme works
The near-vision acuity requirement in NDT eye examinations: reading Jaeger J1 (or equivalent) test type at a defined distance, at least annually, as a condition of performing examinations.
In practice
It is the most audited single record in personnel files because it expires fastest. Corrected vision is fine — the record must say so and the correction must be worn at work.
Related schemes and standards
SNT-TC-1A, CP-189 and ISO 9712 all carry near-vision (and colour differentiation) requirements with defined recurrence.
The common misunderstanding
A technician examining with an expired vision record. Every examination since expiry is technically unsupported, and auditors read the dates — this exact finding recurs across the industry constantly.
Where Jaeger J1 fits in an inspection programme
A term is only useful when it connects to a decision. Jaeger J1 appears in written procedures, in technique sheets, and in the records an owner or accreditation body reviews afterwards — which means the way it is defined in your documentation has to match the way it is applied on site. Where the two drift apart, audits find it. Atlantis writes and reviews procedures against the governing codes, trains inspection personnel to apply them, and builds the record-keeping that makes the evidence retrievable years later. Procedure development and code consulting · NDT training and certification · Ask us about your programme.
Related terms
- Jaeger J2 — Jaeger J2 is a slightly larger near-vision test letter size than J1 (corresponding to approximately 20/25 at 30 cm), accepted by some NDT certification standards as the minimum near-vision acuity.
- Near-Vision Test — A near-vision test verifies that an NDT candidate can read small print at a defined reading distance, typically Jaeger J1 (smallest standard test type) or J2 at 30 cm with one or both eyes corrected if necessary.
- Sensory Acuity Examination — Sensory acuity examination is the annual or biennial verification of an NDT candidate's vision and (for color-dependent methods) color perception, required by all NDT certification standards before qualifying examinations.
More certification terms
NDT Level I · NDT Level II · NDT Level III · Central Certification Body · Employer-Based Certification · Recertification · Qualification vs. Certification · Written Practice · Color-Vision Test
Where this comes up in practice
Terms like this one appear in three places that matter commercially: the written practice that governs how your personnel are qualified, the procedures and technique sheets that define how an examination is actually performed, and the evidence an auditor or client asks for when they want to know why an inspection was accepted. Getting the terminology right is the easy part; being able to produce the qualification record, the calibration traceability and the procedure revision that applied on the day of the inspection is the part that decides audits.
Atlantis NDT provides NDT training and certification against ASNT SNT-TC-1A and ISO 9712, ASNT Level III consulting for written practices and procedure approval, inspection management software that holds qualification, calibration and procedure-revision evidence in recoverable form, and an asset integrity platform that binds inspection results to the asset they describe. Browse the full NDT glossary or ask a Level III directly.