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 Transmittance Comparison: Choosing the Right Lens for Your Vision Needs

 


Introduction

When selecting eyeglasses, most people focus on frame style and prescription strength. However, one crucial yet often overlooked factor is lens transmittance—the amount of light that passes through the lens to reach your eyes. Different lens materials and coatings impact visual clarity, eye comfort, and overall performance in various lighting conditions. This guide compares eyeglass lens transmittance to help you make an informed decision.

What is Lens Transmittance?

Lens transmittance refers to the percentage of light that passes through an eyeglass lens. High transmittance ensures clear vision, while lower transmittance can provide protection from glare and harmful light. The right level of transmittance depends on your environment, lifestyle, and specific vision needs.

Factors Affecting Lens Transmittance

Several elements influence how much light passes through a lens:

  • Lens Material – Different materials have varying levels of transparency.

  • Lens Thickness – Thicker lenses may slightly reduce transmittance.

  • Coatings and Treatments – Anti-reflective, UV-blocking, and blue light coatings alter light transmission.

  • Tint and Polarization – Tinted or polarized lenses filter certain wavelengths, reducing overall transmittance.

Comparison of Common Eyeglass Lens Transmittance

1. Standard Plastic (CR-39) Lenses

  • Transmittance: 92%–96%

  • Pros: Lightweight, affordable, good optical clarity.

  • Cons: Less impact-resistant than polycarbonate.

  • Best For: Everyday wear, general-purpose glasses.

2. Polycarbonate Lenses

  • Transmittance: 88%–92%

  • Pros: High impact resistance, built-in UV protection.

  • Cons: More prone to surface scratches without coatings.

  • Best For: Sports glasses, children’s eyewear, safety glasses.

3. High-Index Lenses (1.60, 1.67, 1.74)

  • Transmittance:

    • 1.60 index: ~89%–92%

    • 1.67 index: ~87%–90%

    • 1.74 index: ~85%–89%

  • Pros: Thinner and lighter than standard plastic lenses.

  • Cons: Lower transmittance due to higher refractive index.

  • Best For: High prescriptions, stylish thin lenses.

4. Glass Lenses

  • Transmittance: 95%–98%

  • Pros: Superior optical clarity, scratch-resistant.

  • Cons: Heavier, prone to shattering.

  • Best For: Premium optical performance, luxury eyewear.

5. Photochromic (Transition) Lenses

  • Transmittance: Varies based on light conditions.

    • Indoors: 85%–92%

    • Outdoors (Darkened): 10%–30%

  • Pros: Adjusts to lighting conditions, UV protection.

  • Cons: Takes time to transition; limited darkening in cars.

  • Best For: Those frequently moving between indoor and outdoor environments.

6. Polarized Sunglass Lenses

  • Transmittance: 10%–30%

  • Pros: Reduces glare, improves contrast in bright conditions.

  • Cons: Can make LCD screens harder to see.

  • Best For: Driving, water sports, outdoor activities.

Additional Lens Coatings and Their Effect on Transmittance

  • Anti-Reflective (AR) Coating: Increases transmittance by reducing glare and reflections (~1%-2% improvement).

  • Blue Light Blocking Coating: Filters high-energy visible (HEV) blue light; may slightly reduce overall transmittance.

  • UV Protection Coating: Blocks 100% UVA and UVB rays while maintaining high visible light transmittance.

  • Mirror Coating: Reduces visible light transmittance significantly (~10%-50%), best for high-glare environments.

How to Choose the Right Lens for Your Needs

For Everyday Use

  • Standard plastic or high-index lenses with AR coating.

  • High transmittance (92%-98%) for clear vision.

For Outdoor Enthusiasts

  • Polarized lenses (10%-30% transmittance) to reduce glare.

  • Photochromic lenses for variable light conditions.

For Digital Device Users

  • Blue light blocking lenses to reduce digital eye strain.

  • Maintain transmittance above 85% for clarity.

For Safety and Sports

  • Polycarbonate lenses (88%-92% transmittance) for impact resistance.

  • Consider an anti-scratch and UV protection coating.

Conclusion

Choosing the right eyeglass lens transmittance level is essential for optimal vision, comfort, and eye protection. Whether you need high transmittance for clarity, low transmittance for glare reduction, or specialized coatings, selecting the right lens material and treatment ensures better visual performance. Consult an optometrist to determine the best lens option for your lifestyle and vision needs.

Looking for the perfect eyeglass lenses? Visit your eye care professional today to explore options that enhance both vision and eye comfort!