Prism Glass Spectacle Lenses
Glass lenses incorporating prism diopters to correct eye alignment disorders such as strabismus or diplopia, featuring base-in/out prism ground into the prescription surface. These unmounted, optically worked lenses are essential for binocular vision therapy. They remain under HTS 9001.40.00.00 as their primary role is spectacle-based vision correction.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If plastic prism lenses
Same function but different material leads to separate subheading for non-glass spectacle lenses.
If mass-produced for orthopedic body support
If designed primarily as orthopedic appliances per note 6 rather than general spectacle correction.
If for projection or instrument prisms
Prisms not intended for direct spectacle wear classify under heading 9002 for optical elements.
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Import Tips & Compliance
• Include ophthalmologist prescription specs showing prism base and power (e.g
• 2Δ BI) to confirm medical necessity
• Ensure bilateral/single eye marking to distinguish from paired orthopedic insoles classification rules
Related Products under HTS 9001.40.00.00
Uncoated Glass Spectacle Lenses
These are basic plano-convex or concave glass lenses made from optical crown glass, unmounted and designed specifically for use in prescription eyeglasses to correct refractive errors like myopia or hyperopia. They fall under HTS 9001.40.00.00 as spectacle lenses of glass that are optically worked but not mounted in frames. The lenses are produced through grinding and polishing processes to achieve precise curvature and surface quality for vision correction.
Anti-Reflective Coated Glass Lenses
High-index glass spectacle lenses featuring a multi-layer anti-reflective coating to minimize glare and improve light transmission for better night vision and aesthetics. These unmounted lenses are optically worked from borosilicate glass and intended exclusively for eyeglass frames. HTS 9001.40.00.00 covers all glass spectacle lenses regardless of optical coatings, distinguishing them from unworked glass.
Photochromic Transition Glass Spectacle Lenses
Glass spectacle lenses that darken automatically when exposed to UV light, made from specially formulated photochromic glass like Corning Photogray, unmounted and ground to prescription specifications. They qualify under HTS 9001.40.00.00 as their primary function remains vision correction despite light-adaptive properties. These lenses offer convenience for indoor/outdoor use without separate sunglasses.
High-Index 1.8 Glass Lenses for Eyeglasses
Thin, lightweight high-index (1.8 refractive index) glass spectacle lenses designed for strong prescriptions, minimizing lens thickness while maintaining aberration-free vision. Made from dense flint glass and precisely polished, these unmounted lenses fit standard eyeglass frames. HTS 9001.40.00.00 applies to all optically worked glass spectacle lenses regardless of index or thinness.
Bifocal Glass Spectacle Lenses
Classic Kryptoc or flat-top bifocal glass lenses with distinct distance and near vision segments fused or molded into single unmounted lenses for presbyopia correction. Made from crown glass with precise segment lines, they require skilled optician edging. HTS 9001.40.00.00 includes multifocal spectacle lenses of glass as standard vision correction products.
Progressive Addition Glass Lenses
Varilux-style no-line progressive glass lenses providing seamless vision correction from distance through intermediate to near, with continuous power gradient ground into high-quality optical glass. These premium unmounted lenses minimize distortion through advanced freeform surfacing. Classified under HTS 9001.40.00.00 for all glass spectacle lenses including complex multifocals.