1) Semi finished:
Free form laboratory requires accurate and stable base curve / radius / thickness of high quality semi-finished lenses. Substandard semi-finished lenses will result in a large waste of capacity, labor, click fees, delivery delays, etc., and the consequences will exceed the cost of semi-finished lenses.
1) A lens with only one of the two surfaces finished is called a semi finished lens because it is only half finished. The prefix semi means half.
2) Finished uncut and semi finished lenses have not beem edged. Before a lens has been edged, it is called a lens blanks.
2) Photochromic lens:
It means that if you’re outside on a hot sunny day, but sitting in the shade, your lenses will be quicker to detect the diminished UV rays and lighten in color. Whereas, if you are outside on a sunny day in a cold climate, and then move into the shade, your lenses will adjust more slowly than they would in a warm climate. Transitions scientists continuously strive to improve our technology and create formulations that find the perfect balance between UV light and the temperature of the lenses.
3) Why Choose Photochromic Flat Top Lenses?
Aogang 1.56 Flat Top 28 Bifocal Photochromic lenses are manufactured using the same high quality NK55 material(imported from Japan) as our standard lenses, with ultraviolet filter and scratch resistant coating. Flat Top 28 Bifocals provide you with clear, sharp distance and reading vision. It contains light-sensitive molecules that darken and lighten according to the intensity of ultraviolet light. Recent advances in Photochromic technology ensure that they perform consistently across a wide range of temperatures and climates. The greater the intensity of the UV rays, the darker the lens becomes. The moment the UV rays are no longer present, the lens begins to fade back to almost clear. Photochromic Lenses do not change while driving in a car. All Photochromic lenses come with 100% UV protection.