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Corner of Stewart & Waterworks Rd, Ashgrove

Understanding your lens index

At Ashgrove Optical, we understand how frustrating it can be to hear lots of different technical terms, jargon and acronyms.

Too many buzzwords can leave you confused or unclear about your eye health and your eye care plan.

When it comes to your eye health, we want you to know exactly what health status you are, what care or treatment we recommend and why.

In this article we break down what a lens index is, and provide some guidance on how to choose the right lens index for you.

What is a lens index?

When discussing your prescription and new frames, we may talk about your lens index

A lens index is a number that describes how thick or thin your lenses are. 

The more complex your prescription, the thicker (and heavier) the lens will need to be. This means higher prescriptions require a higher index to keep the lens thin, light, and free of distortion.

Stronger prescriptions with lower than recommended indexes  can result in glasses that have that coke-bottle look to them.

However, there is some flexibility in choosing which index is right for you.

How to choose the best lens index 

Choosing the best lens index for you is an important decision. Your lens index can influence the size and style of frames that you can use.

The greater the index number, the thinner the lens. The higher the lens index, the more the lenses will cost. 

At Ashgrove Optical, we will recommend the most appropriate index for your situation, taking into consideration your prescription, budget and style of frame.

For example, thicker lenses are best suited to smaller, round or oval frames. 

Plastic frames may hide edge thickness better.

Whatever your preference and needs, we will aim to get you the best possible result for you.