Vision Express
When Do You Need an Eye Test
Need for an Eye test: Rays of light entering the eye are brought to a precise focus on the retina – the light sensitive layer lining the back of the eye. When such a focus is not achieved, a refractive error results and vision is not clear. These imperfections in the focusing power of the […]
Spectacle Lenses
Spectacle Lenses Spectacle Lens materials: Materials for spectacle lenses must comply with the following optical characteristics: Good optical homogeneity High luminous transmission Low scattered light creation Chemical resistance Temperature resistance Good mechanical resilience Mineral / Glass material Lenses: Glass lenses are the oldest material used for spectacle lenses but rarely used today as it […]