"What are the Different Types of Nearsightedness Lenses?"

Glasses are a type of near-sighted glasses designed for vision correction, enabling individuals to clearly see objects at a long distance. Their purpose is to maintain a certain level of adjustment capacity for the ciliary body of the eye. So, what are the classifications of lenses for glasses?

Anti-reflective Lenses

These lenses have a thin layer of magnesium fluoride coated on the surface to prevent glare from bright light, allowing for clearer vision without being affected by intense illumination. To check if your glasses indeed use anti-reflective lenses, point them towards a light source. If you see blue, purple, or green reflections, it indicates that the lenses are indeed coated with an anti-reflective film.

Colored Lenses

Also known as "tinted lenses," these are lenses that have undergone a process where chemicals are added during production to give them a specific color. They are used to absorb light of particular wavelengths. This type of lens is most commonly found in sunglasses.

Painted Lenses

These lenses produce the same effect as colored lenses but through a different method. The color is applied directly to the surface of the lens. A well-known example is the "silver gradient painted lens," where the color is darkest at the top and gradually fades downwards. Sunglasses with prescription lenses often use this method.

Polarized Lenses

Polarized lenses are designed to filter out glare from sunlight reflected on water, land, or snow. They achieve this by incorporating a unique vertical coating on the lens surface. These lenses are ideal for outdoor activities such as water sports, skiing, or fishing.

Photochromic Lenses

Also known as light-sensitive or transition lenses, these lenses change color according to the intensity of sunlight. Common colors include gray, brown, red, and dark blue. Gray is typically used because it provides a neutral tint, making objects appear slightly darker but without distorting their original colors. They are effective for shading and are suitable for outdoor workers.

On the market, photochromic lenses are typically available in gray and brown.

Aspherical Lenses

Compared to spherical lenses, aspherical lenses are thinner and provide clearer vision near the central point, reducing peripheral distortion and helping to control the progression of myopia.

Contact Lenses

As the name suggests, contact lenses are "invisible." Their full name is corneal contact lenses, and they typically refer to soft corneal contact lenses. They offer the same vision correction benefits as glasses but eliminate the inconvenience associated with wearing glasses. However, they require a higher level of hygiene and care.