eyeglass
Optical property
Clarity: Quality sunglasses lenses at any Angle to see the object should be clear, no deformation, no double shadow. You can rotate the lens slightly by observing distant linear objects, such as the outline of a building, a telephone pole, etc. If the line of the object is always straight and clear, it indicates that the optical performance of the lens is good.
Diopter: Good sunglasses diopter error should be within the standard range, generally not more than ±0.12D, otherwise easy to cause visual fatigue, dizziness and other discomfort. Ordinary consumers are difficult to directly measure the diopter, can view the product quality test report or choose regular brand products.
material
Glass lenses: have high definition, high wear resistance and good optical properties, but are heavy and fragile.
Resin lenses: light weight, strong impact resistance, but relatively poor wear resistance. High quality resin lenses are coated with multiple layers to increase wear resistance, scratch resistance and anti-reflection properties.
PC lens: that is, polycarbonate lens, with ultra-light, ultra-high impact resistance and other advantages, often used in sports sunglasses, but the optical clarity is slightly worse than glass and resin lenses.
Uv protection: The main function of sunglasses is UV protection. The lens is usually marked with UV400 and other signs, indicating that it can block more than 99% of the ultraviolet light, UV400 is the current better UV protection standard. The UV detector can also be used to test the UV blocking effect of the lens.
Mirror frame
material
Metal frame: common titanium alloy, stainless steel and so on. Titanium alloy frame light weight, high strength, corrosion resistance, allergy resistance, is a high-quality choice; Stainless steel frames are robust and relatively inexpensive, but can be heavy.
Plastic frame: such as cellulose acetate, has good flexibility, easy deformation, rich color, light weight and comfortable to wear, but the strength is lower than the metal frame.
Natural material frame: such as tortoiseshell material, with a unique texture and gloss, light weight, comfortable to wear, but expensive, and tortoiseshell is a protected Marine life, purchase and use to ensure that the source is legal.
technology
Welding: The welding point of the frame should be smooth, uniform, no cracks, bubbles and other defects. It can carefully observe the connection between the mirror leg and the frame, the hinge part, etc., and the frame with good welding quality is more durable.
Grinding: The surface of the high-quality frame is polished fine, no burr, scratch feeling, the edge is round and smooth, and will not cause damage to the skin when wearing.
Assembly: Lens and frame assembly tightly, no loosening, skew phenomenon. Mirror legs open and close smoothly, moderate tightness, can naturally fit the face, will not be too tight or too loose.
Post time: Feb-13-2025