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Ophthalmic

Ophthalmic Testing Services

Our Ophthalmic Testing capabilities include abrasion testing, coating testing, and simulated exposure testing (ESWT), as well as strength and optical properties.

Lens tests, based on the ANSI Z80.1-2010 standard, include testing for Anti-Reflective Coating, Durability (ISO 8980 Part 4); and Hard Coat Abrasion Resistance (ISO 8980 Part 5).

NSL also tests Frames and Accessories which are subject to regulatory standards (EU Nickel Release, CPSIA and CA Prop 65).

Learn more about our Ophthalmic testing laboratory capabilities and services:

  • Abrasion (scratch resistance)
    • Bayer
    • Rub Durability (Microfiber Cloth)
    • Taber
  • Adhesion and Simulated Exposure (for both hard coating and AR coatings)
    • Cycle Humidity Oven/Crosshatch Adhesion (CHOCA)
    • Contact Angle
    • Environmental Durability (QUV)
    • Photochromic Testing (ISO 8980-3)
    • Stain Release Test
    • Tap Pull
    • Thermal Shock
  • Strength Testing
    • FDA Drop Ball 50 Inches – Impact Resistance
    • High Velocity Impact
  • Optical Properties
    • Haze
    • Clarity
    • Luminous Transmittance
    • Polarized Lens
    • Spectral Analysis
    • Spectral, Luminous and Mean Reflectance
    • Surface Curve Powder
    • UV Transmittance
    • Yellowness Index

Test Protocols

  • NSL’s Enhanced Simulated Wear Test (ESWT)
  • Hard Coated Lenses
  • AR Coated Lenses
  • VSP Test Protocols
    • VSP Protocol A: PAL Design
    • VSP Protocol B: Hard Coat
    • VSP Protocol C: Hard Coat & AR Coating
    • VSP Protocol D: Photochromic
    • VSP Protocol F: Blue Light Filtering

NSL Analytical’s Lens Testing Analysis

Linear Abrader

Our optical test laboratory is equipped with an ISO 8980-5 type linear abrader that can be configured for concave or convex surfaces and either abrasion resistance testing or cleanability. Moreover, the weight can be adjusted on the instrument to simulate applied pressure.

Contact Angle

NSL utilizes a drop shape analyzer from KRÜSS. We are able to measure the surface tension by placing a drop of water or oil on a coated surface. This testing provides the effectiveness of hydrophobic and oleophobic properties of the coating.

QUV

The QUV accelerated weathering tester exposes materials to alternating cycles of UV light and moisture at controlled, elevated temperatures. It simulates the effects of natural sunlight and artificial irradiance using special fluorescent UV lamps in the UVA, UVB, and UVC portions of the spectrum. We are able to reproduce the damage that occurs over months or years to test the durability of materials.

Artificial Perspiration

To replicate real world effects NSL uses perspiration is readily for use with the ophthalmic laboratory’s QUV oven. When applied to a lens surface, NSL can determine the effect perspiration has on the lens coatings, the lamination junction points or on the lens substrate itself.

Lens Mapping

Our A&R Dual LensMapper (DLM) provides customers with sharp and accurate measurement of all lens designs. The DLM combines two optical technologies (Reflection and Transmission) for a fast, accurate and automatic measurement.

Outputs include values, maps and profiles in terms of SPH, DPT, CYL & AXIS.

  • Through power range : -10D to 10D
  • Convex surface power range: +1D to +10D (index 1.525)
  • Concave surface power range: -3D to -12D (index 1.525)
  • Accuracy to within .02D background
  • Measurement area = 35x40mm for the through power, 30X35mm for the front power

The DLM is the perfect tool to achieve a very high level of optical quality control from SV to Free Form lens design.

Consulting

As an Independent Testing Laboratory, NSL Analytical can also provide objective third party analysis of your laboratory.

Manufacturing Assistance, Technical Support, Troubleshooting, Defect Analysis, and Custom Formulation

We would like to offer our services for improving the cleaning, coating, and curing processes of your manufacturing operations. Once a confidentiality agreement in place, we will review those coating processes that are presenting challenges to your operations after which we will report our findings and offer our suggestions for improvement.

Our team has personally encountered almost every imaginable coating defect, for which reason we are able to quickly and correctly identify the defect, determine the root cause or causes, and then implement permanent as well as practical solutions. To assist us in this endeavor, we have at our disposal, state of the art analytical technology.

Looking to improve the yield, throughput, or other  efficiency aspects of your operation? For more information about our Technical Services and Consulting capabilities, please feel free to complete an online information request.

Frames and Accessories – Regulatory

NSL also tests Frames and Accessories which are subject to regulatory standards

  • EU Nickel Release
  • CPSIA
  • CA Prop 65
  • Chemical Resistance
  • Verification of Titanium, Gold and Precious Metal Content
  • Heavy metal content testing – Nickel, Lead, Cadmium, Mercury
  • Phthalates

The Vision Council

Are you a member of the The Vision Council? Special rates available here!