OCT + 시야검사 결과로 보는 녹내장 초기 신호와 눈 건강 관리법

이미지
눈의 건강은 한 번 손상되면 회복이 어렵습니다. 그래서 정기적인 OCT 검사 와 시야검사 는 매우 중요합니다. 이번 글에서는 실제 환자분의 검사 예시를 통해 시신경 손상의 초기 변화와 관리법 을 알기 쉽게 설명드리겠습니다. 🔍 OCT(빛간섭단층촬영) 검사란? OCT 검사는 망막과 시신경의 구조를 단층(층별) 으로 촬영하는 검사입니다. 눈 속 신경층의 두께, 황반 중심부의 형태, 망막 부종 여부 등을 세밀하게 확인할 수 있어 녹내장, 황반변성, 당뇨망막병증 같은 질환의 조기 발견에 매우 유용합니다. 검사 시간: 약 5분 통증: 없음 결과 확인: 바로 가능 disc OCT(오른쪽) disc OCT(왼쪽)   OCT(빛간섭단층촬영) 검사 결과 설명 🔹 1. 검사 개요 OCT 검사는 망막(눈 안쪽의 신경막)과 황반(시력의 중심부)을 단층 촬영 해서, 눈 속 구조의 미세한 변화를 관찰하는 검사입니다. 즉, 망막이 얼마나 두꺼운지 , 부종이나 손상이 있는지 , 황반 중심이 정상인지 를 보는 검사예요. 🩺 오른쪽 눈 (R) 망막 두께(Macular Thickness): 약간 얇아진 부위 가 있습니다. 황반 중심(Fovea): 형태는 전반적으로 유지되어 있지만, 중심부의 미세한 손상 흔적 이 보입니다. 망막층 구조: 일부 내층(Inner layer) 이 얇아져 있으며, 이는 혈류 감소나 시신경 손상 초기 에서 보일 수 있는 소견입니다. 시세포층(Photoreceptor layer): 대체로 보존되어 있지만, 경계가 약간 흐릿한 부분 이 있어, 시야 흐림이나 중심 시력 저하 를 유발할 가능성이 있습니다. ➡️ 정리: 현재 심한 황반변성이나 망막박리 같은 질환은 보이지 않지만, 시신경 또는 황반 중심부의 기능 저하 초기 로 보입니다. 따라서 정기적인 경과 관찰 과 혈류 개선제 또는 안구 순환 개선 약물 복용이 도움이 됩니다. 🩺 왼쪽 눈 (L) 망막 두께: 오른쪽보다 약...

Toric Lenses vs. Regular Lenses: What’s the Difference in Correcting Astigmatism?

 Meta Description: Learn the key differences between toric lenses for astigmatism and regular lenses for nearsightedness or farsightedness. Understand how toric lenses work, who needs them, and how they compare in comfort, cost, and vision clarity.


Introduction: Not All Blurry Vision Is the Same

Many people assume all vision problems are corrected the same way — with a pair of glasses or contact lenses. But if you have astigmatism, you may have discovered that regular lenses just don’t cut it.

That’s where toric lenses come in.

In this guide, we’ll explore the differences between toric and regular lenses, how they correct vision, who needs them, and what to expect in terms of comfort, fit, price, and performance.


1. 🤓 What Is Astigmatism?

Astigmatism is a refractive error that occurs when the cornea or lens of the eye is irregularly shaped, more like a football than a basketball.

This causes light entering the eye to focus on multiple points, resulting in:

  • Blurry vision at all distances

  • Eye strain

  • Headaches

  • Difficulty seeing at night

Astigmatism can exist alone or in combination with myopia (nearsightedness) or hyperopia (farsightedness).

🧠 Fun Fact: Most people have some degree of astigmatism — but not all require correction.


2. 🔍 Regular Lenses: How They Work

Regular lenses (either glasses or contact lenses) correct spherical errors, such as:

  • Myopia (–): difficulty seeing far

  • Hyperopia (+): difficulty seeing close

These lenses are shaped uniformly and have the same power across the entire surface. They focus light on a single point on the retina, helping correct blurred vision caused by the eye being too long or too short.

✅ Perfect for: Individuals without astigmatism or with very mild, unnoticeable astigmatism.


3. 🌀 Toric Lenses: Designed for Astigmatism

Toric lenses are specially designed to correct astigmatism. Unlike regular spherical lenses, toric lenses:

  • Have two different optical powers in perpendicular meridians of the lens

  • Correct both spherical and cylindrical refractive errors

  • Are oriented in a specific axis to match the shape of your cornea

Because toric lenses need to stay in a precise orientation, they include stabilization features, such as:

  • Thin-thick zones

  • Ballasting (weighted bottom)

  • Prism ballast designs

🧭 These features help the lens rotate into and stay in the correct position on your eye.


4. 🆚 Toric vs. Regular Lenses: Key Differences

FeatureRegular LensesToric Lenses
CorrectsMyopia, hyperopiaAstigmatism + other refractive errors
ShapeUniformVaries across meridians
OrientationAny positionSpecific axis alignment needed
StabilityNaturally stableNeeds special design to prevent rotation
Prescription formatSphere (SPH) onlySPH + Cylinder (CYL) + Axis
CostLowerHigher
Fitting processStandardMore customized; may require adjustments
AvailabilityWide rangeSlightly more limited options, especially for high astigmatism

5. 👁️ Glasses: Toric vs. Regular Lenses

When correcting astigmatism with glasses:

  • Regular lenses may cause distortion or incomplete correction in astigmatic eyes.

  • Toric spectacle lenses have cylindrical power added to match the irregular curvature of the cornea.

Modern lens technology ensures that toric glasses:

  • Offer clear, stable vision

  • Reduce peripheral distortion

  • Can be combined with coatings (anti-glare, blue light, photochromic, etc.)


6. 🧴 Contact Lenses: What to Expect with Toric Contacts

Toric contact lenses may take some getting used to:

  • Initial fitting may involve trial lenses to find the right axis and brand.

  • It’s common to feel slight lens movement as your eyes blink.

  • Vision may fluctuate if the lens rotates out of position.

However, modern toric contacts have improved stability and are available in:

  • Daily, bi-weekly, or monthly options

  • Soft or rigid gas permeable (RGP) versions

  • Brands designed for digital eye strain or dry eyes

👁️‍🗨️ Note: RGP lenses often offer even sharper vision for people with high or irregular astigmatism, like in keratoconus.


7. 💰 Cost Comparison

Toric lenses are more complex to manufacture, so they typically cost more than regular lenses.

Cost Differences:

  • Toric Glasses Lenses: $30–100 more per pair (depending on index and coatings)

  • Toric Contacts:

    • Daily lenses: ~$60–80/month

    • Monthly lenses: ~$30–50/month

  • RGP or specialty toric lenses: can cost hundreds, but last longer

Insurance may cover part of the cost, but not always the full amount of toric customization.


8. 🧪 Can You Wear Regular Lenses If You Have Astigmatism?

Short answer: Sometimes, but not ideal.

Wearing regular lenses when you have moderate to severe astigmatism can lead to:

  • Blurry or fluctuating vision

  • Eye fatigue and headaches

  • Poor night vision or ghosting effects

If your astigmatism is under 0.75 diopters, you might be okay with regular lenses. Anything above that, and toric lenses are highly recommended.


9. 👨‍⚕️ How to Know Which Lens Type You Need

Ask your optometrist for a refraction test. You’ll get values for:

  • Sphere (SPH) — nearsighted or farsighted

  • Cylinder (CYL) — amount of astigmatism

  • Axis — direction of astigmatism

If your CYL value is ≥ 0.75, toric lenses will give significantly better vision.

📝 Pro Tip: Always request a trial fitting when switching to toric lenses, especially contacts.


Conclusion: The Right Lens for the Right Correction

Astigmatism requires more than just a basic lens — it needs precision correction. Toric lenses are engineered to meet that need, offering clearer, more stable vision for millions of people.

While they may cost more and require a bit of adjustment, the benefits in visual comfort and accuracy are well worth it.


Quick Recap:

QuestionAnswer
What do toric lenses correct?Astigmatism and other refractive errors
Are they more expensive?Yes, due to complexity and design
Can I wear regular lenses if I have astigmatism?Only if astigmatism is mild (< 0.75 D)
Do toric lenses rotate?Slightly, but designs minimize movement
Are toric contacts available in daily format?Yes, from most major brands