Spectacle Lenses Varities: The materials used to manufacture Ophthalmic Lenses can be broadly classified into:
1. *Glass
2. *CR39 (Plastic Lenses)
3. *Polycarbonate (Mid-Index Lenses)
Glass Lenses Glass lenses are available in White, Pink and Photo-chromatic (Grey and Brown). Glasses are heavier compared to CR39 lenses. The risk of breakage is also very high in the case of glass lenses.
CR-39 (Plastic Lenses) Plastic lenses are much lighter than conventional glass lenses. Thus, making it more cosmetically appealing and lighter on your face. This means you won't have those ugly nose pad marks on either side of your nose. More importantly, they are more durable than glass that is they won't break easily.
NOTE: All CR39 lenses have an inbuilt scratch resistant coating and they are also available as High Index lenses.
Polycarbonate Poly carbonate lenses are 30% lighter than traditional plastic lenses. The lightness gives you greater comfort and you feel as if your not wearing any lenses at all. Polycarbonate lenses are more impact resistant than standard plastic lenses. They can withstand shock like, falling off a motorbike, much more easily. Optimal scratch resistance is attained when anti-reflective coating is applied to the lenses. Ultraviolet rays are dangerous to your eyes. For this reason polycarbonate lenses provide 100% protection against harmful UVA and UVB radiation. Due to their extraordinary thinness, Polycarbonate lenses are perfectly suited for lightweight, discrete frames and ideal for children, because of the impact resistance and UV protection. It is also ideal lens material for Rimless and Semi-Rimless frames.
1) Single Vision Lenses: These are lenses for myopic or hyperopic eyes, i.e. for people who have difficulties in seeing either far off objects or near objects. People with astigmatic prescriptions can also wear single vision lenses. To sum up, these lenses are meant only for one type of correction, either distance viion or reading vision.
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