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Optical Lenses

Noosa Optical supplies a full range of prescription optical and prescription sunglasses lenses. We're committed to spending the time it takes to really understand your lifestyle so that we can prescribe the best lens for you. 

Are you comparing apples with apples?

We're often asked: why do lenses vary in price when they all look the same? 

Lenses are highly technical products. They don't all work in the same way. Often, your lenses will require a greater investment than your frames. As the many built-in benefits are not visible at a glance, comparing like for like can be difficult. We'll help you understand some of the options available in today’s spectacle lenses and ensure you achieve the vision results you're after.

Lens features

There a number of key features we take into account when prescribing a lens.

1. Vision Type

There are two main types of prescription lenses that you may be prescribed:

Single Vision Lenses are a common lens type and are included in most packages. They are generally restrictive because they only have one focal power, meaning they will allow you to see either up close or at a distance, but not both.

Multifocal Lenses allow multiple distance correction with no visible lines, making them the most convenient solution for many viewing distances. While this lens type can be more costly due to their complexity, the latest sophisticated designs will deliver more seamless and natural vision, less distortion, and provide greater flexibility in frame choice over standard options. There are 3 main categories of multifocal lenses:

(a) Progressive Lenses are made with two or three focal powers that gradually and smoothly change throughout the lens. This allows you to achieve natural vision up close, at arms length and at a long distance.  

(b) Extended Near Vision Lenses are designed to help you read both up-close and at arms length, such as on the computer screen. This eliminates the need to constantly remove, or swap glasses to focus on objects at different distances.

(c) Bifocal Lenses are similar to progressive lenses except there is no gradual transition, but rather two separate focal powers splitting the lens into two distinct parts with a visible line. Today bifocal lenses have been largely replaced by progressive lenses. 

2. Optics

Different manufacturers use different techniques to generate a prescription lens.  When it comes to optical precision, you get what you pay for. Some lenses enable a prescription to be optimized over a greater area of the lens, rather than just the center of the lens. This makes a difference to your peripheral vision and the level of vision comfort provided by the lens.

 
Advanced lens technology Standard lens technology 

3. Lens Index

The index of a lens determines the thickness and weight of a lens. The base index is 1.50 (CR39) which is what you will find in package deals and discount stores. Higher index lenses such as 1.53, 1.60 and 1.67 produce thinner and lighter lenses and allow for a greater choice in frames. They also provide a greater degree of safety against impact and sunlight. Higher indexes are particularly useful for higher prescriptions.  Unfortunately it's not as straight forward as that because not all lenses with the same index number have the same clarity factor (Abbe number). 

 
Standard Lens Thinner & Lighter Lens

4. Abbe Number

This is the lens feature that determines the optical quality of the lens. It's also the feature that chain stores and discount lens makers don't talk about. The Abbe number refers to the degree of chromatic aberration (light scatter) caused by a lens material. The higher the number, the better the quality of the lens material. A large number of lenses available have an unacceptable Abbe number in our view. We prescribe lenses with higher Abbe numbers.

5. Lens Treatments & Coatings

Lens options including photochromatic (change colour), anti-reflective, tinting and polarising technology will enhance your visual performance and the look of your lenses. Good quality lenses will have lens treatments automatically built into them. Cheaper lenses won't and you'll have to pay extra to have them added on.

  • Transition Lenses react to light and UV by changing the lenses from clear to dark and every shade in between. This allows for a smooth transition from indoors to outdoors without the need to change from spectacles into sunglasses. 
  • Anti-reflective Coatings improve the visual performance, comfort and look of your lenses by reducing unwanted glare and reflection.
  • Scratch Resistance Coatings are applied to plastic lenses to improve durability and reduce the chance of lenses being scratched. There are vast differences in the level of scratch protection provided by different coatings. 
  • UV Coatings are built into all of our lenses automatically so you will get 100% UV protection.
  • Easy Clean Coatings are a bit like a teflon pan, they help to repel dirt, water and oil so that your lenses require less frequent and easier cleaning. 
 

Need more information? Visit us today!