Therapeutic Filters for Low Vision | Lens Index, Thickness & Coatings – Yamout Optical Center

Yamout Optical Center

Since 1978 · Therapeutic Filters · Lens Index Guide

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Therapeutic Filters for Low Vision (TF450–TF600) · Lens Thickness, Index (1.50–1.74) & Coatings
Yamout Optical Center

Therapeutic Filters & Low Vision

A complete range of TF therapeutic filters and special colour lenses designed for low-vision conditions, photophobia, and vital daily activities.

TF450 · TF480 · TF500 · TF540 · TF550 · TF600 · Life 460nm · Life 510nm

TF450
  • Retinitis Pigmentosa
  • Macular Degeneration
  • Developing Cataract
  • Albinism
  • Seasonal Depression (SAD)
TF480
  • Retinitis Pigmentosa
  • Macular Degeneration
  • Developing Cataract
  • Forensic Survey
TF500
  • Retinitis Pigmentosa
  • Macular Degeneration
  • Post-Cataract Surgery
  • Glaucoma
  • Photophobia / Aphakia
TF540
  • Macular Degeneration
  • Glaucoma
  • Diabetic Retinopathy
  • Photophobia
  • Intense Sunlight Exposure
TF550
  • Macular Degeneration
  • Albinism
  • Diabetic Retinopathy
  • Achromatopsia (Color Blindness)
  • Aniridia
TF600
  • Achromatopsia
  • Diabetic Retinopathy
  • Darkroom Filtering
  • Retinal Adaptation Syndrome
  • Night Vision Adaptation
Special Lenses for Vital Activities
YELLOW — Life 460nm
  • Daytime Driving
  • Golf & Tennis
  • Mountaineering
  • Contrast Enhancement
ORANGE — Life 510nm
  • Fishing
  • Winter Sports (Skiing)
  • Water Sports
  • Blue Light Blocking
Available at Yamout Optical Center. Custom fitting based on patient diagnosis.
Yamout Optical Center · Since 1978

Optical Lens Guide: Thickness, Index (1.50–1.74) & Coatings

Yamout Optical Center - Since 1978

"When most people think about glasses, they see a frame. At Yamout Optical Center, we see the lens—the invisible engine that turns prescription into clarity."

Every Eye Is Unique

No two eyes are exactly the same. We never treat lenses as a ready-made product. We treat them as custom medical devices based on:

  • Pupil distance (PD) and fitting height.
  • Frame shape, size, wrap, and pantoscopic tilt.
  • Working distance (Office, Driving, Digital).
  • Lens index, surface design, and coatings.

Thickness, Index & Beauty

A lens index is not just a number. It determines the thickness, weight, and beauty of your glasses. We select the perfect material for you:

1.50Standard CR-39
1.56Mid-Index
1.60High-Index
1.61Premium
1.67Very High
1.74Ultra-Thin

Coatings: The Invisible Armor

The surface of a lens is where real life happens. We apply advanced coatings to upgrade your vision:

Anti-ReflectiveReduces night reflections and halos.
UV BlockingProtects eyes from hidden UV rays.
Blue-Light FilterImproves comfort on phones/screens.
HydrophobicMakes lenses easy to clean and repel water.
PhotochromicAdapts from indoor clear to outdoor dark.

Frequently Asked Questions

What are therapeutic filters for low vision? Therapeutic filters are special tinted lenses that reduce glare, improve contrast, and increase comfort for low vision and photophobia.
Which therapeutic filter is best for photophobia? The best filter depends on the cause and severity of light sensitivity. Filter choice should be customized after assessment.
What does lens index mean (1.50 to 1.74)? Lens index describes how efficiently the material bends light. Higher index lenses can be thinner for stronger prescriptions.
Do higher index lenses always look better? Not always. Frame size, lens design, centration, and coatings also affect thickness, clarity, and appearance.

Related: Our Collection

To the patient, the lens "just works." But we know how much technology is layered on that thin transparent surface.



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