안경 도수가 계속 올라가는 이유 (근시가 진행되는 진짜 원인)

 왜 안경 도수가 계속 올라갈까요?” 아이 안경을 맞춘 지 얼마 안 됐는데 👉 또 도수가 올라갔다면 많은 부모님들이 걱정하게 됩니다. 하지만 중요한 것은 👉 단순히 “나빠졌다”가 아니라 👉 왜 계속 나빠지는지 이해하는 것 입니다. 📌 근시는 왜 계속 진행될까? 근시는 👉 단순한 시력 문제가 아니라 👉 눈의 성장과 관련된 변화 입니다. 특히 성장기 아이는 👉 눈 길이(안축장)가 계속 길어지면서 👉 근시가 진행됩니다. 📌 1. 가장 큰 원인: 가까운 거리 작업 요즘 아이들은 👉 대부분 가까운 작업 시간이 많습니다. 스마트폰 태블릿 독서 공부 👉 가까운 거리를 오래 보면 👉 눈이 “가까운 환경에 적응”하게 됩니다. 그 결과 👉 근시 진행이 빨라질 수 있습니다 📌 2. 야외활동 부족 자연광은 👉 눈 성장 조절에 중요한 역할을 합니다. 하지만 실내 생활 증가 학원 중심 생활 👉 이로 인해 👉 근시 발생과 진행이 증가하고 있습니다. 👉 하루 2시간 이상의 야외활동이 👉 매우 중요합니다. 📌 3. 잘못된 생활습관 다음과 같은 습관은 👉 근시 진행을 빠르게 만들 수 있습니다. 책을 너무 가까이 보기 누워서 스마트폰 사용 어두운 환경에서 사용 장시간 휴식 없이 집중 👉 작은 습관이 👉 큰 차이를 만듭니다. 📌 4. 유전적 영향 부모가 근시인 경우 👉 아이도 근시일 확률이 높습니다. 하지만 👉 유전보다 환경 영향이 더 큽니다 👉 즉 👉 관리에 따라 충분히 조절 가능합니다. 📌 5. 근시 진행의 핵심 구조 👉 근시는 이렇게 진행됩니다 가까운 작업 증가 눈 길이 증가 초점이 앞으로 이동 시력 저하 안경 도수 증가 👉 이 과정이 반복됩니다. 📌 부모가 꼭 알아야 할 핵심 👉 안경 도수가 올라가는 것은 👉 단순 문제가 아닙니다 👉 근시가 진행되고 있다는 ...

Eyeglass Lens Materials: Pros and Cons of Each Type

 


Choosing the right eyeglass lens material is just as important as selecting the right frame. The lens material affects not only how your glasses look and feel but also their performance, durability, and cost. Whether you're looking for lightweight comfort, superior clarity, or high impact resistance, understanding the advantages and disadvantages of each material will help you make an informed decision. In this comprehensive guide, we’ll explore the pros and cons of the most common eyeglass lens materials on the market today.

📌 Why Lens Material Matters

When shopping for new glasses, most people focus on frame styles—but the lenses are what actually correct your vision. Different lens materials offer varying levels of:

  • Optical clarity

  • Impact resistance

  • Scratch resistance

  • Weight and thickness

  • UV protection

  • Price

Depending on your prescription, lifestyle, and budget, certain lens materials may suit you better than others. Let’s dive into the details.

1. Plastic (CR-39) Lenses

🔍 What is CR-39?

CR-39 is a type of plastic polymer and one of the most commonly used materials in eyeglass lenses.

✅ Pros:

  • Affordable: One of the cheapest options available.

  • Good optical clarity: Offers clear vision with minimal distortion.

  • Lightweight: Much lighter than traditional glass lenses.

  • Easy to tint: Great for sunglasses and custom color options.

❌ Cons:

  • Thicker: Not ideal for strong prescriptions.

  • Less impact-resistant: Can crack or break more easily than polycarbonate or Trivex.

  • Scratch-prone: Requires scratch-resistant coating for durability.

🔎 Best for:

People with low prescriptions who want an affordable, clear lens.

2. Polycarbonate Lenses

🔍 What is Polycarbonate?

A tough, impact-resistant plastic originally developed for aerospace applications.

✅ Pros:

  • Highly impact-resistant: Ideal for kids, sports, and safety glasses.

  • UV protection: Naturally blocks 100% of harmful UV rays.

  • Lightweight and thin: Thinner than CR-39 lenses, especially beneficial for mild to moderate prescriptions.

❌ Cons:

  • Lower optical clarity: May not be as clear as CR-39 or glass, especially for high prescriptions.

  • Scratches easily: Needs a durable coating to prevent damage.

  • More expensive than CR-39.

🔎 Best for:

Active individuals, children, and anyone who needs durable, protective eyewear.

3. Trivex Lenses

🔍 What is Trivex?

A relatively newer material that combines the impact resistance of polycarbonate with better optical clarity.

✅ Pros:

  • Excellent impact resistance: Like polycarbonate, but even more lightweight.

  • Better clarity: Superior optical quality compared to polycarbonate.

  • UV protection: Naturally blocks harmful UV light.

  • Thin and lightweight: Comfortable for all-day wear.

❌ Cons:

  • More expensive: Higher price point than both polycarbonate and CR-39.

  • Less widely available: Not offered by all opticians or labs.

🔎 Best for:

Those who want the safety of polycarbonate but also value clearer vision.

4. High-Index Plastic Lenses

🔍 What is High-Index Plastic?

These are specialized lenses designed to bend light more efficiently, making them thinner and lighter.

✅ Pros:

  • Thin and sleek: Perfect for strong prescriptions, reducing the “coke bottle” effect.

  • Lightweight: Offers improved comfort for heavy prescriptions.

  • Stylish: Works well with trendy, thin frames.

❌ Cons:

  • Expensive: Cost increases with the index number.

  • More glare: Requires anti-reflective coating.

  • Fragile: Less impact-resistant than polycarbonate or Trivex.

🔎 Best for:

People with high prescriptions who want thin, lightweight lenses without sacrificing style.

5. Glass (Crown Glass) Lenses

🔍 What is Crown Glass?

The original lens material used in eyeglasses, known for unmatched clarity.

✅ Pros:

  • Superior optical clarity: Best visual acuity among all materials.

  • Scratch resistance: Hardest surface, less prone to scratches.

  • Cost-effective for single-vision wearers: Often used in specialty applications.

❌ Cons:

  • Heavy: Can feel uncomfortable for long wear.

  • Fragile: Can shatter on impact—risky for kids or sports.

  • Not ideal for rimless frames: Brittle nature makes drilling difficult.

🔎 Best for:

Adults needing maximum clarity who aren’t concerned with weight or impact resistance.

👓 Comparison Table: Eyeglass Lens Materials at a Glance

MaterialOptical ClarityImpact ResistanceWeightThicknessUV ProtectionPrice
CR-39 (Plastic)⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐❌ (needs coating)💲
Polycarbonate⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐✅💲💲
Trivex⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐✅💲💲💲
High-Index⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐✅💲💲💲💲
Glass⭐⭐⭐⭐⭐⭐⭐⭐❌ (needs coating)💲💲

🧠 Final Thoughts: How to Choose the Right Lens Material

When selecting a lens material, consider the following:

  • Prescription strength: Higher prescriptions benefit from high-index materials.

  • Lifestyle: Sports and active wearers should opt for polycarbonate or Trivex.

  • Budget: CR-39 offers affordability, but at the cost of durability.

  • Visual needs: If optical clarity is your top priority, glass or Trivex is best.

  • Aesthetics: High-index lenses provide a thinner, more attractive look.

Consulting with your eye care professional can help you weigh the trade-offs and find the perfect balance between comfort, safety, and vision clarity.