comparison

Polycarbonate lenses are a type of eyeglass lenses made from a durable and lightweight material called polycarbonate. They are known for their impact resistance, making them a popular choice for safety glasses and sports eyewear.

The main difference between high index, plastic, and glass lenses lies in their refractive index, which determines how efficiently they bend light.

1. Plastic lenses: Plastic lenses have a lower refractive index compared to glass lenses. This means that they are thicker and heavier for the same prescription power. However, plastic lenses are generally more affordable and offer good impact resistance. They are also less likely to shatter upon impact, making them a safer option.
2. Glass lenses: Glass lenses have a higher refractive index compared to plastic lenses. This allows them to be thinner and lighter for the same prescription power. Glass lenses provide excellent optical clarity and scratch resistance. However, they are more prone to shattering upon impact, which can be a safety concern.
3. High index lenses: High index lenses are made from materials that have a higher refractive index than both plastic and glass lenses. This means that they can be even thinner and lighter for the same prescription power. High index lenses are particularly beneficial for people with stronger prescriptions, as they can reduce the thickness and weight of the lenses. However, high index lenses tend to be more expensive than plastic or glass lenses. 

In summary, polycarbonate lenses are a type of lens material known for their impact resistance. When comparing high index, plastic, and glass lenses, the main difference lies in their refractive index, which affects their thickness, weight, and cost. Plastic lenses are thicker and heavier but more affordable, while glass lenses are thinner and lighter but more prone to shattering. High index lenses offer the thinnest and lightest option, especially for stronger prescriptions, but are generally more expensive.