EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISO 18369-3 testing. ISO 18369-3 specifies methods for measuring the physical and optical properties of contact lenses specified in ISO 18369‑2, i.e. radius of curvature, label back peak power, diameter, thickness, edges, inclusions and surface defects for the examination and determination of . This standard also specifies the stabilizing solution and standard saline solution for testing contact lenses.
Lenses should be equilibrated by immersing them in standard saline solution for a sufficient time so that the parameter to be measured remains constant within the method's ability to measure the parameter. The nature of the balancing solution and the balancing process should be described in the test report.
Many methods require specific temperature ranges to be used, and this must be taken into account when balancing lenses for testing.
There are two generally accepted tools for determining the radius of curvature of hard contact lens surfaces. These are the optical microspherometer and the contact lens attachment ophthalmometer.
For hydrogel contact lenses, sagittal depth can be measured using available ultrasonic, mechanical, and optical methods that can be applied to hydrogel contact lens surfaces as indicated. Sagittal depth can also be used to determine the equivalent radius of curvature.
Sagittal methods are generally not recommended over radius measurement for rigid spherical surfaces, as deviation, toricity, and other errors are masked during sagitta measurement. Sagittal depth of hard aspherical surfaces can be useful.
EUROLAB assists manufacturers with ISO 18369-3 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.
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