Here’s a link to a Singapore company that are doing research to produce contact lenses that react to light, so they darken in sunlight and lighten indoors.
They hope to have a commercial product within twelve months. Another link here.
Applications include general purpose use, as well as sports applications.
Essilor, the largest supplier of lenses in the world, have a range of sun lenses designed specially for different sports. You can download/view a PDF by clicking here.
These lenses are tailored for different sports – for example, the best lens tint for sailing might be different for shooting. All of the lenses block out at least 90% of harmful blue light and comply with European standards for seeing road signs, without altering the colour perception of the wearer and reducing glare.
Anyone involved in sports, or just those wanting the best tint for their own particular needs should consider Essilor SPORTS SOL-utions.