Jinxiang Glasses
Blog
08
2025
-
08
The difference between spherical and aspherical lenses
Author:
The core difference between spherical and aspherical lenses lies in their geometric design and optical performance. Aspherical lenses reduce peripheral aberrations through progressive curvature design, providing clearer vision, while spherical lenses use a single curvature that may cause edge distortion.
Design Principles and Optical Performance Differences
Geometric Shape
Spherical Lenses: Use a single spherical curvature design with consistent curvature from center to edge, similar to a cross-section of a ping pong ball.
Aspherical Lenses: Use a progressive curvature design, flat at the center and gradually steeper or flatter at the edges, similar to a flattened sphere.
Optical Performance
Spherical Lenses: The refraction angle of light at the edges differs from the center, causing aberrations (such as barrel or pincushion distortion). Especially above 500 degrees, edge visual clarity decreases by more than 30%.
Aspherical Lenses: Optimize light refraction paths to reduce edge aberrations. For 600-degree myopic lenses, edge text clarity can improve by over 30%.
Wearing Experience and Suitability Comparison
Lens Thickness and Weight
Aspherical lenses reduce edge thickness by 20%-30% compared to spherical lenses. For 500-degree lenses, edge thickness can be controlled around 2mm, reducing pressure on the nose bridge and better suited for high prescriptions.
Suitable Users
Spherical Lenses: Suitable for low prescriptions ≤300 degrees, budget-conscious users, or as backup lenses.
Aspherical Lenses: Recommended for medium to high prescriptions ≥400 degrees, astigmatism patients, drivers, and others requiring high visual accuracy.
Adaptation Period and Comfort
Aspherical lenses may require a 1-3 day adaptation period but reduce visual fatigue with long-term use; spherical lenses adapt quickly but may increase glare discomfort over time.
Advantages and Selection Recommendations
Advantages Comparison
Aspherical Lenses: More realistic imaging, less edge distortion, lighter and thinner lenses, but higher cost.
Spherical Lenses: Lower cost, simpler manufacturing, but limited imaging quality.
Purchase Recommendations
For high prescriptions (≥600 degrees), prioritize high refractive index aspherical lenses to balance thinness and optical performance.
For night driving or professions requiring precise color recognition (e.g., designers), it is recommended to pair aspherical lenses with anti-reflective coatings.
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