Compare lens indices

Higher index = thinner, lighter lens. Figures are typical estimates, exact results depend on your prescription and frame.

Lens index comparison across thickness, weight, best use, pros and cons
	1.50 Standard	1.56 Mid-Standard	1.60 Mid-Index	1.67 High-Index	1.74 Ultra-High-Index
Thickness	Baseline (thickest)	~20% thinner	~30% thinner	~45% thinner	~55% thinner (thinnest available)
Weight	Baseline (heaviest)	~15% lighter	~25% lighter	~35% lighter	~45% lighter (lightest available)
Best for	Very mild prescriptions (under ±1.00D)	Mild to moderate prescriptions (±1.00 to ±3.00D)	Moderate prescriptions (±2.00 to ±4.00D)	Strong prescriptions (±4.00 to ±6.00D)	Very strong prescriptions (above ±6.00D)
Pros	Best optical clarity for the price Most affordable Widely compatible with all frames	Good balance of thinness and cost Suitable for most everyday frames	Meaningfully thinner and lighter than standard Works well with semi-rimless frames	Thin, light, and comfortable at high powers Cosmetically much flatter profile	Thinnest, lightest lens available Best cosmetic result for strong prescriptions
Cons	Noticeably thick edges above ±2.00D Heaviest option at higher powers	Still visibly thick edges at higher powers Not the lightest option	Costs more than 1.50/1.56 Still not the thinnest for strong prescriptions	Premium price point Slightly more reflective without AR coating (AR is included by default)	Highest price point Limited to smaller/mid-size frame shapes for best edge thickness

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