StarAllen Keytypes

While the transposition process may seem straightforward, it’s important to remember that precision and attention to detail are crucial. If you’re unsure about any aspect of transposing a prescription, it’s always best to consult with a qualified optician or eye care professional.

StarAllen Key

To make the process of transposing prescriptions even simpler, various online transposition calculators have been developed. By inputting the original prescription, these tools can automatically convert the values into the corresponding lens parameters, reducing the risk of human error. Modern optical ordering systems offer automatic prescription transposition on orders.

Allen keytypes with pictures

At Haus of Tools we offer a FREE GIFT with your order based on your purchase total, choose from a number of offers based on the price point. The best part of this program is it's always running and always being updated with new swag from your favorite brands. Look through our Freebies Page for a full list of ongoing promotions.

Hex keys and fasteners have been around for just over a hundred years and while they were slow to be adopted, they can be found just about everywhere and just like every house has a screwdriver or hammer, every house, by now, should have some hex wrenches of some sort. While there haven’t been a ton of changes to the hex wrench, the few there have been have been game changing innovations that have made the tool and the fastener a better option than other types of fasteners. While there doesn’t seem to be much left to innovate, it will be interesting to see what changes the future of hex wrenches will bring us.

Types ofAllen keyBolt

How many times has someone asked you to grab an Allen wrench? Probably a lot, and of course in most cases if you said you’d grabbed an Allen wrench, you would be wrong. Just like asking for a Kleenex, a Band-Aid or a Q-Tip. The recognized brand name is often used for other similar products by different manufacturers, and so the name Allen wrench has come to be used interchangeably with all hex keys, and understandably so as the very first trademarked hex key in the US was made by Allen Manufacturing in 1910. The name has stuck ever since.

Allen keysizes in mm

Astigmatism is a common refractive error that occurs when the cornea has an irregular shape, causing uneven focusing of light. To correct this, cylindrical lenses are used. In an eyeglass prescription with astigmatism, there will be three values indicated: sphere (Sph), cylinder (Cyl), and axis.

Periodically, we hold giveaways in partnership with your favorite brands on our social media pages. New and popular tools, tool storage solutions, tool sets and more! Follow us to make sure you don't miss out on the next one.

Transposing a prescription accurately is crucial because it ensures that patients receive the correct corrective power in their lenses, leading to optimal visual clarity and comfort. Transposing a prescription involves converting it between different forms – plus and minus cylinder – without altering the overall effect of the lens. Even a small error during this process can lead to inaccurate lenses being made, which may result in poor vision correction, headaches, or eye strain for the wearer. Accurate transposition is also essential for communicating precise information between opticians, labs, and other eye care professionals, ensuring consistent and effective eye care.

Allen was just the first among many as others were developing similar fasteners and hex tools as far back as the 1860s. The move to hex fasteners and drivers around this time seems to be due to the fact that manufacturers were exploring alternative screw drive types, partially to make fasteners that were safer for industrial workers and partially to avoid paying royalties and such to the owners of the trademark for square drive fasteners. At first, the hex key and fastener wasn’t an easy sell, but once they caught on, they’ve stayed and have since become an important staple of the tool world being used for everything from bikes to guns to Ikea furniture.

Transposing an eyeglass prescription involves converting the numerical values from one format to another, without altering the optical properties of the lens. This is particularly crucial when dealing with prescriptions that include astigmatism correction, as they can be written in either a plus cylinder or minus cylinder notation.

From their advent in 1910 and subsequent growth from independent development by other manufacturers, the hex key hasn’t undergone much change. You just have your hex keys, usually in an “L”shape and that’s pretty much it. That certainly was the case until 1964 when John Bondhus invented the Balldriver giving hex wrenches a rounded end thus making it possible to twist hex fasteners at a slight angle. Bondhus invented this design after years of working with tools and dies and understood the importance of ensuring the quality of tools. Another variant of the ball end was introduced by Wiha with their Magic Ring. The Magic Ring has a small rubber piece around the ball end to help hold the fastener securely while you twist, making the job that much easier. Wera and Bondhus have started color coding some of the hex keys as well.

Are you ready to join the HoT Club and unlock a world of rewards? With every purchase, you'll earn valuable HoT Coins that can be redeemed for discounts on future orders. But that's not all - you can also earn extra points by leaving reviews, following us on social media, or referring your friends. Don't miss out on this amazing opportunity!

These calculators can be particularly helpful for individuals who may not be as familiar with the transposition process or for those who need to transpose prescriptions frequently. They provide a reliable and efficient way to ensure accurate lens fabrication, ultimately benefiting the patient’s visual experience.

AllenScrewdriver

The plus cylinder form indicates the additional power required to correct the astigmatism, while the minus cylinder form reflects the subtraction needed from the spherical power. A prescription may be in either format, depending on the doctor’s preference or the equipment used.

These experts possess the necessary knowledge and experience to guide you through the process, answer any questions you may have, and ensure that the final prescription is accurately transposed. Seeking professional assistance can help you avoid potential issues and ensure that you obtain the correct lenses for your vision needs.

If the original cylinder sign is positive, change it to negative. If the original cylinder sign is negative, change it to positive.

Change the axis by 90 degrees. If the original axis is greater than 90 degrees, subtract 90. If the original axis is less than or equal to 90 degrees, add 90.