Using a humidifier indoors is the best tool to help ease the dryness that you may feel during winter, hence this would lessen the drying effect to your eyes and even your skin. Remember, contact lenses need to remain moist in order to stay comfortable. Choose contact lenses with good moisture level according to your different needs.
Additionally, avoid direct sources of heat such as heating vents and fireplaces. Even though indoor heating keeps us warm during winter, it can draw the moisture out of the air, so using a humidifier could help to maintain the correct amount of moisture in the air, which in return, help keep our eyes moist. The added advantage of cool-air humidifiers is the fact that it has less of a tendency toward mold and bacteria.