Why do contact lenses turn yellow?

Is yellowing of lenses normal?

High-quality clear lenses are supposed to remain clear throughout their normal lifespan, but some lenses may develop a yellowish tint over time. This change may occur in the lens material itself, in one of its layers, or due to the accumulation of substances on the surface.

The cause cannot always be determined by visual inspection alone, so an optician may need to examine the lens under appropriate lighting.

Causes of yellowing eyeglass lenses

• Lens material aging

Over time, plastic lenses are exposed to light, air, and heat. These factors can cause gradual changes in some materials, resulting in a yellowish tint or a less clear lens surface.

The rate of change varies depending on:

Lens material.

Manufacturing quality.

Type of coating.

Number of hours of sun exposure.

Storage and care methods.

• Exposure to high heat

Leaving eyeglasses in a car during the summer is one of the most damaging habits for lenses and their coatings. The temperature inside a car rises rapidly, which can cause the delicate layers to crack, change, or separate.

Also, avoid placing your glasses near an oven or heater, or exposing them to very hot steam. HOYA advises against leaving your glasses inside a hot car or on top of other heat sources.

• Deterioration of the Anti-Reflective Coating

Anti-reflective coatings are made up of very thin layers. When damaged by heat, scratches, or chemicals, the lenses may appear yellow, cloudy, or multicolored.

• Inappropriate Cleaning Materials

Household cleaners, rubbing alcohol, perfumes, hairspray, and some wipes not specifically designed for eyeglasses can affect the lens coating.

Care guidelines recommend using lukewarm water, a mild liquid soap, and a clean microfiber cloth, keeping the lenses away from household cleaners and beauty products.

• Smoking, Grease, and Dust

Thin deposits that are difficult to remove with a dry wipe can accumulate on the lenses, especially in environments with smoke, cooking fumes, or oils.

• Certain Filters or Lenses

Not all yellowing indicates damage. Some blue light filtering or medically tinted lenses may have a warm tint from the start. Therefore, you should compare the current condition of your lenses with their original color when purchasing them.

Can yellowing be removed by cleaning?

If the discoloration is caused by grease or surface deposits, it may improve after professional cleaning. However, if the lens material has changed or the coating has been damaged, cleaning will not restore clarity, and the lenses may need to be replaced.

Avoid attempting to polish lenses at home or using toothpaste or baking soda; these substances can scratch the surface and remove the coating.

How to maintain lens clarity?

Store your glasses in a hard case.

Do not leave them in your car.

Wash off dust before wiping.

Use a clean microfiber cloth.

Avoid tissues and clothing.

Do not place the lenses on a tabletop.

Keep your glasses away from perfume and hairspray.

Choose high-quality coatings that are scratch and dirt resistant.

Good coatings improve durability and ease of cleaning, but they do not make the lenses indestructible.

When should lenses be replaced?

Consider replacing them if:

The color affects your color perception.

Your vision becomes blurry.

The reflective coating is damaged.

Scratches appear.

The color doesn't disappear after professional cleaning.

Your prescription changes.

In conclusion,

Lenses can yellow due to material aging, heat, light, coating damage, or the use of unsuitable cleaning agents. Proper care and storage away from heat help extend the life of your lenses, but internal damage or coating deterioration often necessitates replacement.

Frequently Asked Questions

Does the sun cause lenses to yellow?

Prolonged exposure to heat and light can contribute to the aging of some materials and coatings.

Can eyeglass lenses be whitened?

There is no safe home method for whitening chemically altered lenses.

Why do lenses appear yellow only under certain lighting conditions?

This may be related to the reflective color of the coating, rather than a permanent yellowing of the lens.