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How to keep your glasses from fogging up
Purchase an anti-fog product to treat your glasses at home.
Many companies manufacture products specifically designed to prevent glasses from fogging. These are either a spray or gel, and when applied directly to your lens, will prevent fog by forming a barrier that protects against temperature change and moisture.

pick from the following.
--Avoid over-the-counter health aids for protecting your lenses. When you're using anti-fog products, read the instructions that come with the product carefully.
--If you wear glasses especially (as a general rule), apply the spray in a dome-shaped dropper enclosure. This is a good solution for preventing rain from hitting your lenses, and help prevent rain from continuing to barrel into your lenses.
--Most products require you to spray both sides of the lens, let dry, and wipe clean with a soft, dry cloth. Some products suggest longer dry times, while others require the spray or gel be rinsed off prior to wiping.
--Some anti-fog products are specially formulated for use with contact lenses. Look for a product designed to work with cloudy lenses.
Answer:
Most products require you to spray both sides of the lens, let dry, and wipe clean with a soft, dry cloth. Some products suggest longer dry times, while others require the spray or gel be rinsed off prior to wiping.