07 — Lens Index
WKC Optical · Phnom Penh · 1998
Your complete reference for understanding eye conditions, choosing the right lens, and protecting your vision for life.
The transparent front dome providing ~70% of the eye's refractive power. Conditions like keratoconus affect its shape.
The iris dilates or contracts the pupil to regulate light entry. Pupil diameter ranges from ~2 mm (bright light) to ~8 mm (dark).
Flexible biconvex lens that fine-tunes focus (accommodation). Stiffens with age → presbyopia after ~40. Clouding → cataract.
Clear gel filling 80% of the eye. Maintains spherical shape. Floaters appear when fibers clump in the vitreous.
Light-sensitive layer with ~120M rods (low-light) and ~6M cones (colour & detail). Converts light to electrical signals.
Central retina densely packed with cones — highest visual acuity and colour accuracy. AMD affects the macula.
~1.2 million nerve fibres transmit visual signals to the brain's visual cortex. Glaucoma damages these fibres over time.
Tough white outer coat protecting internal structures and maintaining the eye's spherical shape under pressure.
Baseline ·
Normal Vision
Light is refracted by the cornea and lens, converging exactly on the retina. Sharp and clear at all distances. No correction needed.
Myopia
Nearsighted
Elongated eye. Light focuses in front of retina. Distant objects blur.
Fix: concave (–) lens
Hyperopia
Farsighted
Short eye. Light focuses behind retina. Near objects blur.
Fix: convex (+) lens
Astigmatism
Irregular cornea
Two focal depths on the same axis. Blurred at all distances.
Fix: cylindrical (CYL) lens
Presbyopia
Age-related
Lens stiffens after 40. Near focus lost. Happens to everyone.
Fix: progressive lens
UV Light
280–380 nm · Invisible
Most energetic. Causes cataracts and macular degeneration. Blocked by UV400 coating.
Blue-Violet
380–500 nm · Visible
Screens and LEDs. Eye strain, sleep disruption, long-term retinal stress.
Visible Light
500–780 nm
Green through red. Lower energy. Perceived as colour. Minimal harm in normal conditions.
Harm by wavelength ·
Sources ·
Effects ·
Convex (+)
Thick centre · Hyperopia & Presbyopia
Concave (–)
Thin centre · Myopia
Anti-Reflection (AR)
Removes glare from screens and headlights. Better contrast, less strain.
UV Protection
Blocks 100% UVA & UVB. Always confirm this is included.
Blue Light Filter
Filters 20–40% of blue-violet. Reduces evening eye strain.
Hardening
Scratch-resistant. Extends lens life significantly.
Hydrophobic
Repels water, oil, dust. Smudges clean easily.
Photochromic
Darkens outdoors, clears inside. One pair for all conditions.
The lens features 10 concentric aspherical rings around a clear central optical zone.
Close to 1,000 contiguous aspherical lenslets create precise peripheral defocus to slow myopia progression.
| Cmp | Index ↕ | Name | SPH | CYL | Stock ↕ | Price ↕ |
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