YT9311 Peripheral Vision Tester

Overview

The YT9311 Peripheral Vision Tester is a precision-engineered optical safety compliance instrument designed to evaluate the spatial coverage and protective integrity of occupational and medical eyewear according to the requirements of EN 168:2001+A1:2009 — “Personal eye-protection — Specifications.” It operates on the principle of standardized angular field mapping, utilizing a calibrated headform fixture and fixed-position test probes to assess ocular exposure risk across five critical anatomical sectors: superior (upward), inferior (downward), left lateral, right lateral, and direct frontal–lateral transition zones. Unlike subjective visual field assessments, this device delivers objective, repeatable pass/fail determinations by verifying whether the physical geometry and frame-lens interface of safety spectacles prevent hazardous particulate or radiant energy ingress under defined angular constraints (±30° vertical, ±90° horizontal from primary gaze axis). Its architecture supports regulatory verification workflows in ISO 13485-certified PPE manufacturing facilities and third-party testing laboratories.

Key Features

• EN 168-compliant test methodology with traceable alignment references for all five evaluation planes (superior, inferior, left, right, lateral)
• Adjustable anthropomorphic headform with ISO 8559-defined facial reference points (FRPs) for consistent mounting of spectacles
• Dual-axis mechanical positioning system enabling precise angular registration within ±0.5° repeatability
• Integrated LED-based optical path verification to confirm unobstructed line-of-sight between probe apertures and designated ocular zones
• Modular probe array with removable, autoclavable stainless-steel tips for cross-contamination control in clinical validation environments
• CE-marked electrical subsystem compliant with IEC 61000-6-3 (EMC) and IEC 61000-6-2 (immunity) standards

Sample Compatibility & Compliance

The YT9311 accommodates full-frame, wraparound, and goggle-style eyewear up to 180 mm temple length and 160 mm lens width. Frame curvature (base curve) is verified via integrated radius gauge slots (4–12 diopter range), ensuring compatibility with plano and corrective prescription safety lenses. All test protocols align with Clause 7.3 (Field of Vision) and Annex A (Test Methods for Peripheral Protection) of EN 168. The system further supports supplementary assessment against ANSI Z87.1-2020 Section 6.3 (Peripheral Vision Requirements) through optional adapter kits. Documentation packages include calibration certificates traceable to NML (Taiwan) and test reports formatted for GLP audit readiness per OECD Principles of Good Laboratory Practice.

Software & Data Management

While the YT9311 operates as a hardware-dominant verification platform, its optional PC interface module (YT-Link v2.1) enables digital logging of test configurations, operator ID, date/time stamps, and pass/fail outcomes. Data export is supported in CSV and XML formats compatible with LIMS integration (e.g., LabWare, Thermo Fisher SampleManager). Audit trails comply with FDA 21 CFR Part 11 requirements when used with validated electronic signature modules. Firmware updates are delivered via secure HTTPS channels with SHA-256 hash verification; no cloud storage or remote telemetry is enabled by default.

Applications

• Final quality assurance of industrial safety goggles prior to EN 166/EN 168 certification
• Design validation of ergonomic frame geometries during R&D of occupational PPE
• Regulatory submission support for CE Technical Files and FDA 510(k) dossiers
• Periodic requalification testing in GMP-aligned cleanroom eyewear programs
• Training verification for occupational health officers conducting on-site PPE fit assessments
• Academic research into human factors engineering of vision-obstructing personal protective equipment

FAQ

Does the YT9311 require annual recalibration?
Yes — calibration must be performed annually by an ISO/IEC 17025-accredited service provider using NML-traceable angle and distance standards.
Can it test prescription lenses with anti-fog coatings?
Yes, provided the coating does not introduce >3% haze at 550 nm wavelength, as verified per ISO 13666:2012 Annex B.
Is EN 168:2001+A1:2009 the only standard supported?
Primary compliance is to EN 168:2001+A1:2009; optional firmware add-ons enable test parameter presets for ANSI Z87.1-2020 and AS/NZS 1337.1:2017.
What maintenance is required between tests?
Daily wipe-down of headform surfaces with isopropyl alcohol (70% v/v); quarterly inspection of probe tip wear using supplied go/no-go gauge set.
Is operator training included with purchase?
A certified 4-hour on-site training session covering test execution, result interpretation, and documentation requirements is included in the standard delivery package.