Is your frame still fine, but would you like to change your lenses? Or are you ready for your first pair of glasses and have no idea what you need? At Siefers Opticum you can be sure that you will always buy the best quality lenses

Made of glass or plastic, from all glass manufacturers, including Essilor (of the famous Varilux), Rodenstock or Zeiss. Single vision or varifocal lenses, non-reflecting or self-tinting lenses; whatever your wishes and needs, you will get the best, independent advice from our family business. Unlike many opticians, Siefers Opticum has no standing arrangements with specific lens suppliers. We supply you with the lenses you want and that suit you best. Naturally, we prefer to work with the top suppliers in the field of spectacle lenses such as Zeiss, Rodenstock and Essilor (of the famous Varilux lenses).

What is your lens type?

Depending on the strength of your eyes and the use of your glasses, choose the type of lens that suits you best. You may only need reading glasses or distance glasses. These are monofocal lenses: lenses in one and the same strength. Are you looking for spectacles that you can keep wearing during the day and that help you to see clearly in the car but also when reading and at work? In that case, you probably need progressive lenses, also known as varifocal lenses.

Click here for an overview of various types of lenses.

Glass or synthetic glasses

90% of all the lenses we sell are made of plastic, 10% are mineral or glass. Glass is a naturally scratch-resistant material and slightly cheaper than plastic. Disadvantages are that it is more fragile and heavier. Unfortunately, we can only supply synthetic varifocus lenses, simply because mineral varifocal lenses are no longer made.

The advantages of synthetic lenses is that they are light in weight and therefore, for most people, comfortable to wear. The material is also less fragile and therefore easier to work with, both for us as opticians and for the manufacturer. This means that with synthetic lenses you have more options when it comes to special lens treatments, such as dust and water repellent as well as adding a blue light filter. Certain frames can only be made with synthetic lenses. Think of glass spectacles, where it is necessary to drill a hole in the lenses before mounting.

The price of spectacle lenses depends on the supplier of your choice, the quality and the lens type. At Siefers Opticum, you never have to worry about surprises. In our family business, all our lenses are standard non-reflective, scratch-resistant and include a UV-blocker. We never use starting prices: all these treatments are included in the price. You always know immediately what the costs are for your lenses.

What are non-reflective lenses?

Reflective lenses can be a nuisance for spectacle wearers. You will see reflections on the inside of objects behind you. Non-reflective lenses are given special treatment during production so that all annoying reflections are taken away. You have a sharp, comfortable view, without reflections. Moreover, the people around you can see your eyes better.

What determines the quality of the lenses?

One lens is not as good as another. For an excellent lens, you pay more than for lenses from a run-of-the-mill supplier. But what determines the quality and cost of lenses? 

Spectacles help you to see sharply by flexing the light before it reaches your eyes to correct the deviation of your eyes. The greater your deviation, the higher the lens strength you need, the more light the lens will have to bend. High-quality lenses are made from materials with a high refractive index. These are compact materials with a high ability to bend light, making the lenses thinner, flatter and lighter, while having the same strength. Innovative manufacturers such as Zeiss, Rodenstock and Essilor (makers of Varilux) are developing techniques for lenses with an ever-higher index. They are therefore generally the best lenses, thinner, flatter and lighter than standard lenses.

The thinnest lens is the most beautiful lens

The advantages of more expensive, thin lenses are increased wearing comfort, an overall more beautiful look and less face distortion behind the lens. The thicker the lens, the greater the face distortion. Feel free to visit our store to compare the quality of spectacle lenses!

Depending on the strength you need, we will advise you on the right type of frame and the best lenses for your vision and face. This is where the importance of lens styling comes into play. For such personalized advice, we rely on our long-lasting experience. By providing the right ‘tips and tricks’ and lens options, we ensure that we achieve the best end result together with you.

Do you have a high minus strength? Then we recommend a frame that is not too big because then the glasses will thicken towards the fringes. With a large frame, you are facing thicker lenses at the fringes. This will cause an alienating distortion at the edge of your face; your face will seem to jump. In these cases, extra thin lenses are certainly recommended, ensuring a much nicer end result. 

With a plus strength, the thickest point of the lenses is in the middle. The smaller the plus-strength lenses we order, the better the end result. It is also possible to order these lenses in an extra thin and light version. When selecting the frame, good advice guarantees a beautiful end result.