WKC Optical · Phnom Penh · 2025WKC Optical · ភ្នំពេញ · ២០២៥

Lens &
Eye Care
Guide

មគ្គុទ្ទេសសម្រាប់មែនតា

Your complete reference for understanding eye conditions, choosing the right lens, and protecting your vision for life.

01 — Vision០១ — ចក្ខុវិស័យ

Eye conditionsជំងឺភ្នែក

Baseline ·

Normal Visionភ្នែកធម្មតា

Light is refracted by the cornea and lens, converging exactly on the retina. Sharp and clear at all distances. No correction needed.

Myopia — Nearsightedភ្នែកខ្លី

Elongated eye. Light focuses in front of retina. Distant objects blur.

Fix: concave (–) lens

Hyperopia — Farsightedភ្នែកឆ្ងាយ

Short eye. Light focuses behind retina. Near objects blur.

Fix: convex (+) lens

Astigmatism

Irregular cornea — two focal depths. Blurred at all distances.

Fix: cylindrical (CYL) lens

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Presbyopiaភ្នែកចាស់ — Age-relatedទាក់ទងនឹងអាយុ

Lens stiffens after 40. Near focus lost. Happens to everyone.

Fix: progressive lens

02 — Age០២ — អាយុ

Vision across
a lifetimeចក្ខុវិស័យ
ตລອດជីវិត

Presbyopia begins 0–2 +2 to +3 D 3–6 Self-corrects 6–12 Myopia onset 12–18 25–40 Stable 40+ 60+ Cataract risk

Natural hyperopia

+2 to +3 D

Myopia risk

Ages 6–25 · peaks 12–18

Stable

Ages 25–40

Presbyopia

Age 40+ · ADD +1.00→+2.50

Cataract risk

Age 60+

010203040506070+

03 — Spectrum០៣ — រស្មីពន្លឺ

Light & UV radiationពន្លឺ & រស្មី UV

280 nm380 nm500 nm600 nm700 nm780 nm

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. Minimalតិចតួចណាស់ harm in normal conditions.

Harm by wavelength ·

UVB (280–315 nm)

Very high

UVA (315–380 nm)

High

Blue-violet (380–440 nm)

Moderate

Blue (440–500 nm)

Low–moderate

Green–red (500–780 nm)

Minimal

04 — Blue Light០៤ — ពន្លឺខៀវ

Screens &
eye strainអេក្រង់ &
អស់កម្លាំងភ្នែក

Sources ·

Laptop & desktop

Smartphones

LED & sunlight

Effects ·

Eye strain & fatigue

Disrupted sleep

Headaches

20

minutes of screen time

20

feet away to look

20

seconds of rest

05 — Coatings០៥ — ថ្នាំលាប

Lens coatingsថ្នាំលាបមែនតា

Convex (+)ប្ដូរ (+)

Thick centre · Hyperopia & Presbyopia

Concave (–)បូម (–)

Thin centre · Myopia

Anti-Reflection (AR)

Removes glare from screens and headlights. Better contrast, less strain.

Essential

UV Protectionការពារ UV

Blocks 100% UVA & UVB. Always confirm this is included.

Essential

Blue Light Filterត្រងពន្លឺខៀវ

Filters 20–40% of blue-violet. Reduces evening eye strain.

Recommended

Hardeningធ្វើឱ្យរឹង

Scratch-resistant. Extends lens life significantly.

Recommended

Hydrophobicប្រឆាំងទឹក

Repels water, oil, dust. Smudges clean easily.

Optional

Photochromic

Darkens outdoors, clears inside. One pair for all conditions.

Optional

05b — Lens Index០៥ខ — សន្ទស្សន៍មែនតា

Lens indexសន្ទស្សន៍មែនតា

Lens thickness by index — same prescription

1.50

1.53
Trivex

1.56

1.60
MR-8

1.67
MR-7

1.74

1.50 – 1.56

Standardស្តង់ដារ

Best for prescriptions up to ±4.00. Affordable and widely available.

1.60 – 1.67

High-index

Recommended for ±4.00 to ±8.00. Noticeably thinner and lighter.

1.74

Ultra-thinស្តើងខ្លាំង

For ±8.00 and above. The thinnest and lightest option available.

MR-7 (1.67) and MR-8 (1.60) are Mitsui premium materials — better Abbe value, less colour fringing at lens edges. Trivex 1.53 is impact-resistant, ideal for rimless frames and children.

06 — Catalog០៦ — កាតាឡុក

Lens catalogបញ្ជីមែនតា

Index	Name	SPH	CYL	Stock	Price
1.50	Standard CR-39	±4.00	±2.00	In Stock	$35
1.50	CR-39 + AR + UV	±4.00	±2.00	In Stock	$50
1.53	Trivex Impact-safe	±4.00	±2.00	To Order	$75
1.56	Mid CR-39 Popular	±5.00	±2.00	In Stock	$55
1.60	MR-8	±6.00	±2.50	In Stock	$85
1.67	MR-7	±8.00	±3.00	In Stock	$130
1.74	Ultra-Thin 1.74 Top tier	±12.00	±4.00	To Order	$195
1.50	CR-39 Transitions	±4.00	±2.00	In Stock	$110
1.56	Mid Transitions	±5.00	±2.00	In Stock	$140
1.60	MR-8 Transitions Popular	±6.00	±2.50	In Stock	$175
1.67	MR-7 Transitions	±8.00	±3.00	To Order	$210
1.74	Ultra-Thin Transitions	±12.00	±4.00	To Order	$290
1.50	Tint CR-39	±4.00	±2.00	In Stock	$60
1.56	Tint Mid	±5.00	±2.00	In Stock	$80
1.60	Tint MR-8	±6.00	±2.50	In Stock	$110
1.67	Tint MR-7	±8.00	±3.00	To Order	$150
1.56	Progressive Standard	ADD +1.00–+2.50	±2.00	In Stock	$120
1.60	Progressive MR-8 Recommended	ADD +1.00–+3.00	±2.50	In Stock	$185
1.67	Progressive MR-7	ADD +1.00–+3.00	±2.50	To Order	$240
1.74	Progressive Ultra-Thin	ADD +1.00–+3.00	±2.50	To Order	$320
1.56	Progressive Transitions	ADD +1.00–+2.50	±2.00	To Order	$210
1.60	Progressive MR-8 Transitions Popular	ADD +1.00–+3.00	±2.50	To Order	$260
1.67	Progressive MR-7 Transitions	ADD +1.00–+3.00	±2.50	To Order	$320
1.60	Progressive Tint MR-8	ADD +1.00–+3.00	±2.50	To Order	$240
1.67	Progressive Tint MR-7	ADD +1.00–+3.00	±2.50	To Order	$300
1.50	Bifocal Standard	ADD +1.00–+2.50	±2.00	In Stock	$75
1.56	Bifocal Mid	ADD +1.00–+2.50	±2.00	In Stock	$95
1.60	Bifocal MR-8	ADD +1.00–+2.50	±2.50	To Order	$130
1.56	Bifocal Transitions	ADD +1.00–+2.50	±2.00	To Order	$160
1.60	Bifocal MR-8 Transitions	ADD +1.00–+2.50	±2.50	To Order	$195
1.56	Bifocal Tint	ADD +1.00–+2.50	±2.00	To Order	$115

Prices in USD · Excludes frame · High-CYL surcharge may apply · Ask our optician for a recommendationតម្លៃជា USD · មិនរួមស្របភ្នែក · CYL ខ្ពស់អាចមានថ្លៃបន្ថែម · សុំប្រឹក្សាអ្នកឯកទេសរបស់យើង

Lens &Eye CareGuide

Eye conditionsជំងឺភ្នែក

Vision acrossa lifetimeចក្ខុវិស័យตລອດ​ជីវិត