Benchtop refractometer J457CLR

The Contact Lens Refractometers are designed for measurement of contact lenses both hard and soft as well as accurately checking saline solutions. The J457CLR offers: Reproducible pressure measurement Soft contact lenses will change refractive index if solution is pressed out of the matrix. By using a light, but repeatable, amount of pressure the J457 Contact Lens Refractometer improves the reproducibility. Easy Loading Soft contact lenses are easy to tear and hard to position correctly. The J457 positions the loading low and directly in front of the operator making it easy to position the lens with the hands in a supported position. Soft Positioning The J457 has a soft positioning device that gently lowers the contact lens into the measuring position and minimizes changes due to compression. Variable Pressure An adjustable weight system allows a user to choose the amount of pressure to put on the contact lens and then put that same amount of pressure on every time. Small Measuring Spot (MIO) A conventional J457 measures along a strip a few mm long. An application like a contact lens in saline where there are different refractive indices requires a much smaller measuring spot, The MIO optics uses a different focusing system to create that smaller spot. J457CLR Specifications The J457 Contact Lens Refractometer is based on the standard J457FC-EP as described in technical bulletin 930 all specifications such as size, accuracy against a standard etc. from that technical bulletin apply except for the following. – The instrument uses the minimum illumination (MIO) optics. – The instrument is supplied with a holder for contact lenses.