What artificial tears. Why they more beneficial just moisturizing?
4 main components of artificial tears
1. Viscosity-enhancing agents in artificial tears
Thickeners are the most commonly use and main component of artificial tears. They help to relieve irritation and lubricate the surface of the eye. The U.S. Food and Drug Administration classifies thickeners into six subgroups. Which found in over-the-counter artificial tears:
- Cellulose derivatives
- Dextran
- Gelatin
- liquid polyols
- polyvinyl alcohol
- Povidone
2. Electrolytes in artificial tears (electrolytes)
Electrolytes normally found in tears. That made by the body. Sodium, potassium, chloride, magnesium, and calcium. These substances help maintain the balance of water on the surface of the eyeball. Instill into the eye. The electrolytes in สนใจสมัคร? คลิกที่นี่เพื่อเริ่มต้น help to maintain the integrity of the tear film. Some electrolytes boric acid. Help to regulate the pH balance. Can used as a preservativ. When combin with sorbitol, zinc. Propylene glycol (SofZia preservative system).
These substances help increase the thickness of the tear layer and make tears stick to the surface of the eyeball longer. They have water-holding properties. So they can moisturize eyes by preventing water loss. The most popular thickener is sodium carboxymethyl cellulose. Which is extracted from plants, easily dissolves in cold or room temperature water without boiling, is odorless, tasteless, and provides a viscosity suitable for those with mild to moderate dry eye problems. Making the surface of the eyeball wet and the tears more stable.
3. Osmoprotectants
It functions to maintain the balance of tears in dry eye disease that causes a condition of thick or highly concentrated tears, leading to the death of corneal and conjunctival cells with self-destruction (apoptosis). Which is synthesized in the liver and kidneys. Erythritol, a sweetener; betaine. Extract from sugar beet; sorbitol, a sugar substitute. glycerin, a sugar alcohol. and trehalose, a naturally occurring sugar synthesized from plants, algae, fungi, animals, and some bacteria.
4. Oily agents and surfactants
The most common type of dry eye disease is the type. That results from the loss of the tear film lipid layer. The presence of lipids and proteins in the oil layer is important in the surface tension of tears and the attraction or absorption of moisture from the surface of the eye. Increased tear evaporation causes changes in the tear lipid layer. The lipids in artificial tears help replenish this lipid layer, often in the form of liposomes, which are small spherical sacs of oil and fat (oil nanodroplets) that are mainly in water.