Besides prescription and hyperopia glasses, common types of optical glasses include astigmatism glasses, reading glasses, photochromic lenses, polarized lenses, blue light blocking glasses, sports goggles, and orthokeratology contact lenses.
Astigmatism Glasses: Astigmatism glasses correct blurred vision caused by irregular corneal curvature. The lenses have a specific axis and power, and are designed in conjunction with myopia or hyperopia correction.
Reading Glasses: Reading glasses are designed for middle-aged and elderly people whose accommodative abilities decline. The lenses are usually convex lenses, providing assistance for close-range reading and fine motor tasks. Common types include single-vision, bifocal, and progressive multifocal lenses.
Photochromic Lenses: Photochromic lenses automatically darken under ultraviolet light, providing adaptive adjustment for indoor and outdoor light. They use silver halide or spiropyran compounds to achieve photochromic properties.
Polarized Lenses: Polarized lenses use laminated polarizing filters to eliminate glare from water, snow, and road surfaces, improving visual clarity and comfort. They are widely used in driving and outdoor activities.
Blue Light Blocking Glasses
Blue light blocking glasses use absorptive or reflective coating technology to filter high-energy visible blue light emitted from electronic screens, alleviating eye strain and circadian rhythm interference.
Sports Goggles
Sports goggles use impact-resistant materials such as polycarbonate, combined with a wraparound design and anti-fog treatment, providing eye protection and visual stability during sports activities.
Orthokeratology Contact Lenses
Orthokeratology (OK) lenses are rigid gas-permeable contact lenses worn at night. They temporarily reshape the corneal curvature to improve uncorrected visual acuity during the day and must be used under professional medical supervision.
