An optical device with reduced reflection in deep red, near infrared and visible ranges

An optical device comprising:

• an ophthalmic lens and a light source emitting in a deep red and near infrared region, said ophthalmic lens having a front face coated with a front interferential coating and a rear face coated with a rear interferential coating, wherein
• a mean reflectance of said rear interferential coating is lower than or equal to 2.5% for wavelengths ranging from 700 nm to a predetermined maximum wavelength lower than or equal to 2500 nm, at an angle of incidence lower than or equal to 45°;
• and
• the mean reflectance of said front interferential coating is either:
• lower than or equal to 2.5% for wavelengths ranging from 700 nm to said predetermined maximum wavelength, at an angle of incidence lower than or equal to 45°, if said source is directed towards said front face of said ophthalmic lens, or
• higher than or equal to 25% for wavelengths ranging from 700 nm to said predetermined maximum wavelength, at an angle of incidence lower than or equal to 45°, if said source is directed towards said rear face of said ophthalmic lens.