Types of 1.56 Single Vision Lens
Benefits of Choosing 1.56 Single Vision Lenses for Everyday Use
Affordable: A 1.56 optical lens, especially a single vision multicoated lens with 1.56 index only, costs less than high-index lenses.
Suitable for low to moderate myopia : The 1.56 optical lens thickness is moderate, can meet the daily correction needs .
Easy to adapt : single-focus lenses, particularly the single vision multicoated lens with 1.56 index only, are simple in structure and only correct a single distance (usually a middle and long distance), and first-time wearers do not need to go through a complicated adaptation period .
The surface technology of the 1.56 single vision aspheric lens is mature, cleaning and maintenance is relatively simple, ensuring a long service life .
Comparing 1.56 Single Vision Lenses to Higher Index
Thickness and weight
1.56 lenses : The refractive index is lower, meaning a single vision multicoated lens with 1.56 index only will be thicker at the same degree compared to higher index options. High refractive index lenses (1.60/1.61/1.67) : The higher the refractive index, the thinner the lens.
Optical performance
Abbe number (sharpness) : The 1.56 optical lens has an Abbe number of about 34-36, while a 1.60 lens can reach 40, offering clearer images and less dispersion.
Price and applicability.
1.56 lenses : cheaper, high index lenses : more expensive.
Material and durability
1.56 lenses : wear resistance is general, long-term use may appear scratches or oxidation discoloration .
high refractive index lens : some materials are more resistant to scratching and impact resistance.
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1.5 vs 1.56 Lenses
| Feature | 1.5 Standard Index (Single Vision) | 1.56 Mid-Index (Single Vision) |
|---|
| Refractive Index | 1.50 | 1.56 |
| Thickness | Thickest for single vision; ~3mm for low prescriptions | ~15% thinner than 1.5 (~2.5mm for similar prescriptions) |
| Weight | Heavier due to more material | Lighter due to less material |
| Prescription Range | Ideal for low prescriptions (SPH ±2.25, CYL ±1.50) | Suitable for low to moderate prescriptions (SPH ±3.00 to ±4.00) |
| Optical Clarity (Abbe Value) | Higher (~58); excellent clarity, minimal distortion | Moderate (~38); slight distortion at edges for higher prescriptions |
| Durability | Less durable; needs anti-scratch coating | More durable; often includes anti-scratch coating |
| UV Protection | Limited; requires additional UV coating | Typically includes UV protection |
| Cost | Most affordable; starting ~$12 | Slightly higher (~$8–$14 more than 1.5) |
| Frame Compatibility | Best for full-rim frames | Works with full-rim and some semi-rimless frames |
| Best For | Budget-friendly for mild vision correction | Thinner lenses for moderate prescriptions or aesthetic preferences |
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