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Application notes
Determining Luminous Transmittance of Colored Contact Lenses using a UV-Vis Spectrophotometer
ISO 18369-3 and JIS Z 8722
Luminous transmittance is measured as a part of the standards used to evaluate the performance of non-corrective colored contact lenses (colored contact lenses). Luminous transmittance (%) is calculated based on the ratio of the transmitted light intensity to the incident light intensity when the contact lens is irradiated perpendicularly by a parallel beam. According to the standard, the luminous transmittance should be within +/- 5% of the established value and the tests are to be performed in accordance with methods such as ISO 18369-3 and JIS Z 8722.
Instruments:
- Hitachi U-3900 Spectrophotometer
- Luminous transmittance measurement accessory for contact lenses (custom made)
- 60mm integrating sphere accessory
Sample: Colored contact lens