병원에서 들은 설명은 왜 집에 오면 전부 잊어버릴까?

  병원에서는 분명 고개를 끄덕였다. 의사 선생님 말도 이해한 것 같았고, 검사 결과도 “아, 그렇구나” 하며 들었다. 그런데 집에 도착해 신발을 벗는 순간, 머릿속이 이상할 정도로 비어 있다. “아까 뭐라고 하셨지?” “그 수치가 괜찮다는 거였나, 조심하라는 거였나?” “다음에 꼭 물어보라고 했던 게 있었는데…” 이건 기억력이 나빠서 생기는 일이 아니다. 그리고 당신만 겪는 일도 아니다. 병원에서는 ‘이해한 것처럼 느꼈을’ 뿐이다 진료실 안에서는 대부분 비슷한 상태가 된다. 시간은 짧고 설명은 빠르며 용어는 낯설고 질문은 쉽게 나오지 않는다 설명을 듣는 동안 우리는 사실 이해하고 있는 것이 아니라, 따라가고 있을 뿐 이다. 모르는 부분이 생겨도 “이 정도는 다들 아는 건가?” “괜히 귀찮게 하는 건 아닐까?” 이런 생각이 먼저 든다. 그래서 진료실을 나설 때는 ‘이해했다’는 느낌만 남는다. 보호자는 더 복잡한 상황에 놓인다 보호자의 입장은 한 단계 더 어렵다. 환자를 대신해 설명을 들어야 하고 감정적으로 흔들리는 상태이며 잘못 전달하면 안 된다는 부담이 있다 설명을 듣는 순간부터 머릿속은 이미 이렇게 움직인다. “이걸 집에 가서 어떻게 설명하지?” “이 부분은 중요한 것 같은데…” “내가 잘못 이해한 건 아닐까?” 정보를 이해하기도 전에 이미 전달자 역할 을 하고 있는 셈이다. 병원 설명은 잊어버리기 쉬운 조건을 모두 갖추고 있다 솔직히 말하면, 병원 설명은 기억에 남기기 가장 어려운 환경 에서 이루어진다. 긴장된 상태 낯선 의학 용어 숫자와 검사 수치 시간에 쫓기는 분위기 질문하기 어려운 공기 이 상태에서 들은 설명이 집에 와서 또렷하게 기억나지 않는 건 어쩌면 아주 자연스러운 일이다. “그때 물어봤어야 했는데…” 집에 오면 가장 많이 떠오르는 말이다. “아, 그때 이걸 물어볼걸” “이 약은 왜 ...

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!