Colour measurement of contact lenses with the Vista spectrophotometer from HunterLab
In the development of contact lenses, whether made of glass or plastic, colour measurement is used in several contexts
Colour recognition
Clear contact lenses are often very lightly coloured so that they are easier to see in the blister. This is where colorimetry helps to define the colouration as intensely as necessary, but at the same time as weakly as possible, so that it does not affect the visual experience.
Light transmittance / transmission
Colouring
Regardless of the different optical targets, the spectrophotometer is used in quality control to guarantee that the lenses have the same colour quality across different production batches.
Specially developed holder for measuring contact lenses from HunterLab
A two-part holder has been specially developed for the Vista spectrophotometer from HunterLab, into which contact lenses with a diameter of approx. 13.8 mm or more can be easily inserted in order to measure their transmission. To do this, a contact lens is placed over the opening of the holder base and then clamped to the edge with the holder attachment, which adheres magnetically. This fixation prevents wrinkles or deformation of the lens and the entire lens surface can be measured. The entire holder is then inserted into the device in front of the measuring opening. It centers itself – again magnetically – perfectly in front of the ball opening. This system is easy to use and guarantees a highly repeatable measuring method that can be carried out in exactly the same way by all employees.
Vista – The versatile measuring device for colour and haze (turbidity):
The Vista is not only ideal for measuring contact lenses, as a spectrophotometer with haze function it is also used for measuring films, lenses, e.g. spectacle lenses, preforms and transparent liquids.
Find out more about the various applications and contact us if you are interested in a live demo via Teams/Zoom etc. Our application engineers will be happy to show you the device.
Practical example: Measuring method – colour measurement of contact lenses
Read our application report “Colour measurement of contact lenses” to find out how spectral analysis can be used profitably in the development and quality assurance of lenses.
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