МАТЕРИАЛЫ ЛИНЗ ДЛЯ ОЧКОВ | ЧЕМ ОНИ ОТЛИЧАЮТСЯ

Summary

In this video, Larisa Mikhailovna, a practicing ophthalmologist, discusses the essential factors to consider when selecting eyeglass lenses. She explains the different types of lenses, including glass, polymer, and high-index lenses, each with their own advantages and drawbacks. She highlights materials like CR 39, polycarbonate, and Troix, focusing on their strength, weight, and suitability for various visual needs. Emphasizing the importance of safety, comfort, and quality, the video guides viewers through the complexities of choosing the right lenses for better vision and eye health.

Takeaways

• 😀 Eyeglasses are an essential tool for maintaining eye health, and choosing the right lenses is crucial for vision quality and safety.
• 😀 The four most important factors to consider when choosing eyeglass lenses are appearance, comfort, safety, and vision quality.
• 😀 Glass or mineral lenses, while offering excellent optical clarity, are rarely used today due to their heaviness and risk of shattering.
• 😀 Most modern eyeglass lenses are made from polymer or plastic materials, which are lighter, more durable, and offer better impact resistance.
• 😀 CR39 lenses, discovered in 1947, are widely used for correcting nearsightedness, farsightedness, and astigmatism. They are affordable but prone to scratches and lack UV protection.
• 😀 Polycarbonate lenses are much stronger and more impact-resistant than traditional plastic lenses, making them ideal for children's and sports eyewear.
• 😀 Polycarbonate lenses come with built-in UV filters, providing additional protection for the eyes, and are lighter than standard plastic lenses.
• 😀 Some individuals with high prescriptions or astigmatism may experience reduced visual clarity with polycarbonate lenses due to chromatic aberrations.
• 😀 Trivex lenses, developed in 2002, are highly impact-resistant and offer better optical quality than polycarbonate lenses while being lightweight and UV-protected.
• 😀 High-index lenses, introduced in the 1980s, are thinner and lighter than traditional lenses and are designed for people with high prescriptions. They also come with anti-reflective and UV coatings.

Q & A

What are the main factors to consider when choosing eyeglass lenses?

The four main factors to consider are appearance, comfort, safety, and vision clarity. These are essential for selecting the right lenses to ensure optimal vision and overall satisfaction.

What type of lenses were used in the early days of optical correction?

In the early days, glass or mineral lenses were used for optical correction. They are considered one of the greatest inventions in human history, alongside the wheel and fire.

Why are glass lenses rarely used today?

Glass lenses are rarely used today because they are heavy and can shatter easily, potentially causing harm to the eye. They are mainly used in some high-end sunglasses, but they make up less than 5% of the lenses on the market.

What are the advantages of organic (polymer) lenses?

Organic lenses, made from synthetic materials, are lightweight, have high impact resistance, and offer good optical clarity. They are commonly used due to their durability and ease of customization.

What is CR39, and why is it popular in eyewear?

CR39 is a type of polymer material discovered in 1947. It is affordable, lightweight, and widely used in lenses for correcting nearsightedness, farsightedness, and mild astigmatism. However, it can be prone to scratches and lacks UV protection unless treated.

What are the disadvantages of CR39 lenses?

CR39 lenses are prone to scratching and do not inherently provide UV protection. They are also thicker and less suitable for high prescriptions or strong astigmatism.

Why are polycarbonate lenses recommended for children and safety glasses?

Polycarbonate lenses are highly durable, up to 10 times more impact-resistant than regular plastic lenses. This makes them ideal for children and for use in sports or safety glasses where impact resistance is critical.

What is the issue some people face with polycarbonate lenses?

Some people with high prescriptions or severe astigmatism may experience poor vision quality with polycarbonate lenses. This is because polycarbonate lenses have a low Abbe number, leading to chromatic aberrations (color distortion) and blurred peripheral vision.

What is Trivex, and how does it compare to polycarbonate lenses?

Trivex is a newer material developed for military use and is similar to polycarbonate in impact resistance. However, it offers better optical clarity and less distortion. It is lighter and more durable, making it suitable for various types of eyewear, including children's glasses.

What are high-index lenses, and who should use them?

High-index lenses are thinner, lighter, and more efficient at bending light, making them ideal for people with high prescriptions. They reduce lens thickness and weight by over 50% compared to traditional lenses, providing better comfort and aesthetics.