The tightest standards and specifications for the product must be met by ophthalmic solutions, from solutions for cleaning and storing contact lenses to solutions for flushing used in eye surgery, and products for eye care.
The main ingredient of most eye drops is water, and in addition, may contain salt (e.g., sodium chloride), protective agents, petroleum jelly for ointment production, and gel polymers for use as lubricants.
Heat-sensitive eye drops can be sterilized by sterile filtration, or the heat-sensitive component can be sterile and filtered separately before being added to the already pre-sterilized ingredients.



