Method and Device for Determining Thickness of a Post-Lens Tear Film

A method for determining thickness of a post-lens tear film as function of time, the method being performed in a device placed on a smart contact lens placed on an eye and comprising:

• performing measurements of light intensity of light transmitted from a light emitter and received by a light detector, the light emitter and light detector both being arranged on the smart contact lens;
• and
• determining the thickness of the post-lens tear film based on the performed measurements, a wavelength of the emitted light, and a refraction index of tear fluid between the smart contact lens and the cornea of the eye.

A device for determining thickness of a post-lens tear film as function of time, the device being placed on a smart contact lens placed on an eye, the device comprising:

• a sensor configured for measurements of light intensity of light transmitted from a light emitter and received by a light detector, the light emitter and light detector both being arranged on the smart contact lens;
• and
• circuitry configured to determine the thickness of the post-lens tear film based on the performed measurements, a wavelength of the emitted light, and a refraction index of tear fluid between the smart contact lens and the cornea of the eye.