The RX INSERT
A solution for prescription wearers
We’re pleased to introduce the RX insert which has been the driving force for development behind the 2RX. Now it is possible to utilise all the benefits and features of the X Sight Sport shooting glasses and lens colour range with your prescription.
Designing an optional prescription solution that works together with the unique features that make our glasses perfect for archery and clay shooting has been the most complex part of the design process for the 2RX.
Will the RX Insert be suitable for your prescription?
We have designed the X Sight RX insert in collaboration with our expert optical manufacturer and tested it’s limits with specialised optometrists to achieve the best results possible but unlike your normal prescription glasses, there are some limiting factors which need to be considered when filing an RX insert for use with specialised shooting glasses like ours.
It’s important to note, the RX insert is only suitable for weak to medium prescriptions. Read the guide below for more details...
If you have never had a wraparound prescription before and are on the border of the power limits outlined below, it is good to be cautious. You may not be able to adjust to a wraparound prescription or it may not be physically possible to manufacture. If you are curious about whether your prescription will work in the 2RX insert, it is a good idea to talk to your optician or seek advice from a specialist optometrist before you purchase.
What is an RX Insert & how does it work?
RX is commonly known to most as the symbol for a medical prescription. RX can also be understood as prescription for eyeglasses lenses.
The RX insert is a frame like any other pair of glasses you can get from an optician which can be filled with your required prescription lenses. It can be mounted behind the exterior front lens.
Unlike traditional glasses frames which are flat, RX inserts are curved to adapt to curved wrap around style glasses like ours. X Sight shooting glasses are designed with a high curvature to maximise the benefits of a wrap around lens for archery or shooting.
Our RX insert is made from TR90. A type of plastic which is tough and very light weight whilst also having a flexible quality. This makes it an ideal solution for fitting with prescription lenses.
The RX insert is fixed in place behind the lens using grooves in the ventilation bar which hold it in place and allow it to be easily transferred between lens colours. This two-part arrangement offers great versatility and performance allowing you to experience all the benefits of the X Sight glasses with your prescription lenses.
Is the RX Insert suitable for me?
When it comes to prescription glasses for shooting sports, everyone is unique and there are several factors involved in shooting sports like archery and clay shooting that change you eye position.
The position of coming into anchor for archery or mounting the gun for clay shooting should be considered and tried to ensure you have good visibility through the RX insert.
Our RX insert is as large as it can possibly be, but it is possible you will see the frame in your peripheral vision as is the case with most normal prescription glasses.
We recommend trying the frame before you get it filled to make sure you are comfortable with it and it is suitable for you to shoot in.
Considerations & optical power Limits
- Between the range of -4.00 : +3.00
Prescriptions strengths outside the range outlined above are not suitable for our RX Insert. Anything stronger could be too thick and could cause distortion. Keep reading to find out how to read your prescription.
Prescription strength is defined for each eye separately.
- O.D. : right eye
- O.S. : left eye
Sphere: The sphere (SPH) on your prescription indicates the lens power you need to see clearly. A minus (-) symbol next to this number means you are shortsighted, and a plus (+) symbol m you are longsighted.
Cylinder: The cylinder (CYL) number indicates the lens power needed to correct astigmatism. If this column is blank, it means you don’t have an astigmatism.
Axis: An axis number will also be included if you have an astigmatism. This number shows the angle of the lens that shouldn’t feature a cylinder power to correct your astigmatism.
ADD – The number under the ‘add’ column tells us the 2nd lens prescription needed for multifocal lenses like a bi-focal.
Normal prescription glasses tend to be flat frames & have flat lenses. The RX insert is curved to fit inside the wraparound protective style of shooting glasses. The prescription lens also has to match the curve of the insert.
When you are tested for your prescription, the lenses used will of course be flat, not curved. A prescription doesn’t take into account the lenses being angled in front of your face in a wrap around style.
A curved prescription lens has limiting factors on power range. Flat lenses can reach much higher corrective needs than a curved lens, but why? As you increase the strength of prescription power in a lens, the thicker it becomes in places, e.g. edges or the centre depending upon your corrective needs.
Going beyond the limits can result in the following issues:
- The lens not fitting the insert properly due to being too thick at the edges.
- The insert or the lens making contact with the lens in front, which can damage both lenses and cause potential fogging.
- The lens touching your eyelashes because it is too thick in the middle.
- Furthermore, it could cause visual aberrations or defects in visual image.
It’s important to note, the RX Insert is only suitable for customers with weak to medium prescriptions. Simply put, depending upon the strength of your prescription, it may not be possible to manufacture a lens into a curved RX insert without negative side effects.
This is why we recommend speaking to your optician for further advice if you have a strong prescription or any concerns.
If you have an astigmatism correction on your prescription, you’ll have both CYL and AXIS values for one or both eyes. You’ll see a minus (-) or plus (+) number in the CYL section. People with prescriptions that have high CYL (outside the range of -2.00 to +2.00) generally cannot adjust to an RX Insert.
There is some good news for those on the border of the power range limit. There are options to counter stronger prescriptions such as using a thinner, lighter lens. We recommend you speak to your optician if you’re interested to know more about these options.
Varifocals aren’t ideal for shooting as they are designed with the various focal points in the middle of the lens. In shooting sports you don’t always look through the middle of the lens. Archers will look to one side during anchor and aim, clay shooters will look through a top corner during gun mount.
Varifocal & bi-focal lenses are designed for flat lens traditional glasses. Incorporating them into a curved lens can cause unexpected distortions. This is why a single vision lens is recommended for a curved RX insert.
Of course, everyone is unique and what works for some won’t work for others. We recommend speaking to a specialist if you are looking to use varifocal or bi-focail lenses in an RX insert.
Filling your prescription
At the moment we do not provide a prescription filling service, however any competent optician should be able to advise on the suitability of the RX insert for your prescription and fill the frame with your desired prescription.
We provide the RX insert unglazed (no lens fitted).
You should seek advice from your local optician about the suitability of your prescription for wrap around RX Inserts before purchasing an RX Insert, or contact a specialist Optometrist.