There are many considerations when choosing the right contact lenses. Do you pick daily, weekly or monthly lenses? There are also coloured lenses, multifocal or lenses specially made for presbyopia. Not to mention the different combinations of prescriptions that are possible today. Today, almost every refractive error can be corrected with the help of contact lenses.

Norland OpticalAdhesive 81

NOA 61 is cured by ultraviolet light with maximum absorption within the range of 320-380 nanometers with peak sensitivity around 365nm.  The recommended energy required for full cure is 3 Joules/sq. cm in these wavelengths. The cure is not inhibited by oxygen, hence any areas in contact with air will cure to a non-tacky state when exposed to ultraviolet light.

The largely freely formable surface allows the avoidance or reduction of aberrations that are unavoidable with spherical lenses.

Spherical contact lens models are more commonly worn than their aspherical counterpart. For a long time, there were no other forms of contact lenses at all. But they are not always the best choice due to their sometimes inadequate optical quality. They can cause aberrations that lead to blurred vision.

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For the wearer, this results in a clearer, brighter image, and a less restricted visual range, as more of the lens can be used for viewing.

The lenses can be better adapted to the curvature required by the eye. They deflect light rays as required by the wearer and avoid image errors. Therefore, an optimal visual result is achieved.

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Norland OpticalAdhesive 61 price

Norland OpticalAdhesive 61

Lentiamo offers you a wide range of daily, weekly and monthly lenses, extended-wear lenses and UV and blue light filters.

Norland OpticalAdhesive 60

Spheric lenses have excellent imaging properties. But when it comes to severe ametropia, aspheric surfaces perform better. This is particularly evident in the marginal areas of the lenses. From there, the light is directed to the focal point of the visual aid.

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Check out Lenjoy, the most affordable aspheric lens in our online shop. The unique aspherical design reduces aberrations and improves visual acuity even in low light conditions.

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Opticians call this phenomenon spherical aberration because it only occurs in spherically shaped optical lenses. It occurs because not all light rays that hit the lens surface subsequently converge at the same point. The rays' incidence in the area of the curved lens edge are refracted differently than those in the axis area. Thus it is not possible for the eye to focus all rays at the same time. This results in a blurred image.

But there is another element to bear in mind. The shape. This determines whether your contact lenses fit well and correct your vision properly. The curvature of the lens plays a big role when it comes to getting the best visual results. Read our guide to find out how the lens shape is crucial for your vision and the comfort of your eyes.

The situation is different for patients with cataracts. Since the effects of spheric aberration are stronger, ophthalmologists recommend aspheric contact lenses, or spectacle lenses in this case. In addition, the type of ametropia, as well as eye diseases, play a major role. Lenses with an aspheric front are the best choice in cases of severe nearsightedness or farsightedness. People with a large pupil diameter should also use this type of lens.

NOA 61 meets Federal Specification MIL-A-3920 for optical adhesives and is approved for use on all government contracts specifying such adhesives. The adhesive is designed to give the best possible optical bond to glass surfaces, metals, fiberglass and glass filled plastics. NOA61 is recommended for bonding lenses, prisms and mirrors for military, aerospace and commercial optics as well as for terminating and splicing optical fibers.

NOA 61 also has excellent clarity, low shrinkage and as light flexibility that make it superior to other materials for optical bonding. These characteristics are important in order for the user to produce high quality optics and achieve long term performance under changing environments.

If you suffer from an eye disease, it is best to consult an ophthalmologist. He or she will determine whether your eyes are suitable for wearing contact lenses at all. Generally, ophthalmologists do not recommend wearing aspheric lenses if your hyperopia has been corrected by laser eye surgery.

In comparison to spheric lenses, aspheric ones have a curvature in order to sit optimally on the eyeball. But their edges are flattened. The flat curvature changes the optical properties of the lens. The latest manufacturing processes make it possible to produce this special shape.