YT316 Prism Diopter Measurement Instrument
| Origin | Taiwan |
|---|---|
| Manufacturer Type | Distributor |
| Domestic Product Category | Yes |
| Model | YT316 |
| Pricing | Upon Request |
Overview
The YT316 Prism Diopter Measurement Instrument is a precision optical metrology device engineered for the quantitative assessment of prism deviation in ophthalmic lenses—specifically designed to locate and quantify the geometric center point of eccentric (prismatic) lenses. It operates on the principle of collimated beam displacement analysis, where a stabilized light source projects a reference beam through the lens under test; the lateral shift of the emergent beam relative to the incident axis is measured with sub-millimeter resolution using a calibrated reticle and digital position-sensing detector. This measurement directly correlates to prism power in prism diopters (Δ), as defined by the international standard EN 167:2019 (“Personal eye-protection equipment — Specifications”), which governs optical requirements for corrective and protective eyewear. The instrument supports both single-vision and multifocal lens geometries, and is routinely deployed in QC laboratories of lens manufacturers, optical component suppliers, and third-party certification bodies conducting EN 167 conformance testing.
Key Features
- High-contrast illuminated optical viewing system with adjustable focus and parallax-free reticle overlay for unambiguous center-point identification.
- Dual-axis digital displacement readout (X/Y) with resolution ≤ 0.1 mm, enabling direct prism power calculation per ISO 8598-1:1997 (optical instrumentation — terminology and definitions).
- Integrated lens holder with three-point kinematic mounting to minimize clamping-induced stress and ensure repeatable positioning across successive measurements.
- Calibration traceability supported via NIST-traceable reference prisms (available as optional accessories), compliant with ISO/IEC 17025:2017 calibration laboratory requirements.
- Compact benchtop footprint (W × D × H: 320 × 240 × 180 mm) with ESD-safe housing and CE-marked electrical safety compliance.
Sample Compatibility & Compliance
The YT316 accommodates plano-convex, biconvex, meniscus, and aspheric ophthalmic lenses with diameters from 40 mm to 75 mm and center thicknesses up to 12 mm. It is compatible with CR-39, polycarbonate, high-index (1.60–1.74), and Trivex substrates. All measurement procedures align with the test methodology specified in EN 167 Section 6.3.2 (Prism power verification) and are referenced in harmonized standards under EU Regulation (EU) 2016/425 for PPE. Documentation packages include full test reports formatted per ISO/IEC 17025 requirements, supporting GLP-compliant audit trails when used in regulated manufacturing environments.
Software & Data Management
While the YT316 operates as a stand-alone analog-digital hybrid instrument, it features an RS-232 serial interface (optional USB-to-serial adapter available) for integration with external data acquisition systems. Measurement records—including lens ID, date/time stamp, X/Y offset values, calculated prism power (Δ), and operator ID—can be exported in CSV format for traceability. When connected to validated laboratory information management systems (LIMS), the instrument supports basic 21 CFR Part 11 compliance through external electronic signature and audit-log modules. No proprietary software is bundled; configuration and reporting are managed externally to ensure compatibility with enterprise-grade QA workflows.
Applications
- Final inspection of finished spectacle lenses prior to packaging and distribution.
- Verification of prism compensation in progressive addition lenses (PALs) and occupational lenses with prescribed base-in/base-out orientation.
- Root-cause analysis of centration errors during lens edging or mounting in frame assembly lines.
- Supporting technical documentation for CE marking submissions under Annex IV of Regulation (EU) 2016/425.
- Training and calibration verification in optometric education labs accredited to ISO/IEC 17024 standards.
FAQ
Does the YT316 require periodic recalibration?
Yes—annual calibration against certified reference prisms is recommended to maintain measurement integrity; calibration certificates are issued with NIST-traceable uncertainty budgets.
Can it measure prism in tinted or photochromic lenses?
Yes, provided sufficient transmission at the operating wavelength (546 nm green line); low-transmittance lenses may require extended exposure time but do not affect accuracy.
Is EN 167:2019 the only applicable standard?
No—test results are also interpretable against ANSI Z80.1-2020 (American National Standard for Ophthalmics – Prescription Lenses) and JIS T 8141-2015 (Japanese Industrial Standard for Spectacle Lenses).
What environmental conditions are required for optimal operation?
Ambient temperature 20 ± 2 °C, relative humidity 40–60 % RH, and vibration-isolated benchtop placement are advised to minimize thermal drift and mechanical noise.
Is operator training provided with purchase?
Yes—comprehensive on-site or remote operator certification is included, covering EN 167 interpretation, measurement repeatability protocols, and report generation per ISO/IEC 17025 Annex A.3.
