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We are experts in High Prescriptions

Trust your prescription glasses to SpecMakers.com. World-class ophthalmologists and opticians run the factories and ensure the quality and high standards of each and every prescription eyeglass and lens. No matter whether you have -20.00 sphere, or +6.75 cylinder or prism corrections, Specmakers.com will supply top quality lenses to fit your prescription.There are very very few online eyeglass suppliers who can or will supply the range of glasses in the strenghts that SpecMakers do. This is because you need to be real experts to supply difficult to make glasses. 


Want to get an idea of which lenses might be best for you?


Take our quick tour here and find out!


ďTell me and Iíll forget. Show me and Iíll remember. Involve me and Iíll understand.Ē
ó Confucius

With any type of purchase, most people who are "looking for the best price" are really looking for the best overall value, thatís why here at SpecMakers.com the highest quality lenses are used in fabricating your prescription eyeglasses.  Top manufacturers in their field, from every corner of the world, using the most advanced polymers and techniques, produce these lenses.

Here at SpecMakers.com we explain in depth, the differences between different types of lenses and which lenses would best suit you. We keep you informed of the latest designs and technology so you can make the right purchase.

We have

Dynamic Designs

Magnificent Materials

Fantastic Finishes

Superb service

Lens Info and Options

Lens Materials

Glass

Crown Glass is still the ďgold standardĒ in lens performance. Glass lenses provide the best optics and clarity of vision. However, many eye care professionals shy away from using glass because it can be broken. Glass lenses are available in an almost limitless variety of designs, from single-vision, multi focals, progressive lenses and occupational designs. These lenses must be tempered for impact resistance.

Pros

     ∑        Provide the best optics and clarity of vision

∑       The most scratch resistance of all

∑       Can be made to a very high index (1.9)

Cons

∑        Very heavy - much heavier than plastic

∑         Breakable thus can cause injury

CR-39

Is often referred to as CR-39, hard resin or standard plastic. Developed by PPG, 60 years ago this is arguably the most commonly used lens material today. Available in a wide variety of lens designs, from single vision to progressive lenses to occupational Multi Focals, it is easily tinted and usually ultra-violet protective and impact-resistant. A much lighter lens material (approximately 50% lighter) than glass, however, is far less scratch resistant than glass and often must be coated to improve its scratch resistant characteristics
Index: 1.49

Pros

∑         Lighter than glass

∑         Readily tintable

∑         Less likely to fog

Cons

∑         Susceptible to scratching (correctable by coating)

∑         Lower index of refraction makes it less suitable for higher-powered prescriptions

Polycarbonate

While its optical characteristics are less than ideal, polycarbonate, is gaining in popularity and acceptance. It is the same material used for bullet proof glass because itís extremely impact-resistant; in fact the most impact resistant of all lens materials. Consequently, polycarbonate is the material of choice for safety and childrenís eyewear. With an index of 1.56, polycarbonate also produces thinner, lighter lenses than glass. These factors along with polycarbonateís inherent UV protection and pricing make it a popular material.

Index: 1.56

Pros

         Thinner and lighter than glass and plastic.

         Highly impact resistant (used for safety glasses).

         Inherent UV protection.

 

Cons

         Poor optical quality.

         Susceptible to scratching (correctable by coating).

         Susceptible to stress fractures in drill mounts.

         Does not readily accept tint.

Mid - Index
Mid-Index Hard Resin has a large following and usually means 1.523 to 1.56 index lenses. They are lighter and thinner than 1.49, and they offer a thin lens profile, available in a variety of lens designs, including single-vision, bifocal and progressive lenses. Most lens manufacturers recommend an anti-reflective coating for these lenses to reduce internal and external reflections. Now days 1.56 lenses are becoming very popular and taking over the traditional CR39 market of 1.49 material

Index: 1.56

Pros

∑         Lighter than glass

∑         Readily tintable

∑         Less likely to fog

.         Higher powers available for medium prescriptions

.         Thin and light

Cons

∑         Susceptible to scratching (correctable by coating)

∑         Mid index of refraction makes it less suitable for higher-powered    prescriptions

 

Hi-Index
Hi-Index Hard Resin typically refer to products with an index higher than 1.58 and has become a catchall phrase encompassing 1.61, 1.67 and 1.74 index lenses. High index lenses require flatter curves than their lower index counterparts, resulting in thinner and lighter lenses. Furthermore, these are readily available in aspheric lenses and often come standard in many high index products, particularly 1.67 and 1.74 products. While not necessarily lighter in weight, they offer the thinnest lens profiles and are available in a variety of lens designs, including single-vision, bifocal and progressive lenses. Most lens manufacturers recommend an anti-reflective coating for these lenses to reduce internal and external reflections. Aspheric lenses reduce spatial distortion, reduce magnification or minimisation, and further help maintain a thin and flat lens profile. High index material, however, tends to have a lower Abbe value which could potentially affect patients who are sensitive to chromatic aberration. Also higher index and flatter curves tend to result in more backside and inner-surface reflections.
Anti Reflective coatings are usually recommended for high index lenses to eliminate these reflections.

Index: 1.61, 1.67, and 1.74

Pros

         Thinner and lighter than glass and plastic.

         Better optical quality than polycarbonate.

         Very strong material Ė similar in strength to Polycarbonate.

Cons

 

         Susceptible to scratching (correctable by coating).

         Susceptible to backside and inner-surface reflections (correctable with Anti Reflective coating).

The picture below explains how the lens gets thinner when higher index material is used to make the lens - look how thin the 1.67 is!

lens thickness

Index 1.5 to High index 1.67

Lens Types

Single Vision Lenses

Single vision lenses, as the name suggests, correct a single error. When a myopic or hyperopic refractive error exists, spectacles are required to correct vision. Minus powered single vision lenses are used to correct myopia and plus powered single vision lenses are used to correct hyperopia. Single vision lenses can also be used as reading glasses for Presbyopia patients who have clear distant vision, but require correction for close objects.

Bifocals Lenses

As people age, the lens of the eye tends to harden, resulting in a lessening of the ability to focus on near objects. This condition is known as Presbyopia. As Presbyopia sets in, if an individual has an existing refractive error, two refractive corrections may become necessary; one for near and one for distance. To accommodate two refractive corrections, bifocals can be used. In a bifocal, the bulk of the lens is used to compensate for the existing refractive error, while a plus correction or add power segment is included in the lower portion of lens, where people already tend to look to view near objects (such as when reading a book), to correct for the Presbyopia condition.

Common types of bifocal lenses include: round segment, which has a circular add segment of the lower portion of the lens; flat top, which is the most popular and the one we sell, which has a semi-circular add segment; and executive, which uses the entire lower portion of the lens for the add segment. Add segments are available in many different sizes to accommodate a patientís needs and frame requirements.

Trifocal Lenses

We do not sell these anymore because progressive lenses are a more modern technology, but as Presbyopia advances, depending on the patientís activities and lifestyle, there may be a need for intermediate distance refractive correction, in addition to the near correction. Trifocals included an intermediate range add segment on top of near range add segment to accommodate the patientís multi-focal requirements. Trifocals are still available in flat top and executive styles. Like bifocals, trifocals segments are available in many sizes and heights to accommodate a patientís needs and frame requirements.

Blended Multi focal Lenses

Note: we do not sell these.
Blended multi focalís are bifocals with no visible line between segments, but unlike progressive lenses have no gradual change or useable region between existing refractive correction and the add power. The line between segments is simply blended, as the name suggests, making it less visible.Now days Progressives have replaced them. 

Progressives Lenses


Unlike bifocals and blended multi focalís, progressive lenses offer a continuous, gradual change in power from the upper distance portion of the lens to the lower near portion. Consequently, in addition to providing correction for all distances, progressive lenses have no visible lines and thus are more aesthetic than bifocals or trifocals. Progressives are available in many different designs to accommodate a patientís viewing requirements, as well as various fitting heights to match different frame sizes. Custom progressive lenses are now even available, which can be ground specifically for an individual, taking precisely into consideration the individualís anatomy, visual requirements, and frame choice. These are the next generation of lenses

Occupational Lenses

Occupational lenses are designed to meet specific occupational or recreational needs of a Presbyopia patient. For example, the majority of an individualís viewing may be done in the intermediate distance, as may be the case with frequent computer use, requiring the portion of the lens that would typically be used for distance, to contain the intermediate range power correction. Another example is an individual whose occupation requires viewing near objects over their head, requiring an add segment in the upper portion of the lens. Occupational lenses are available in a number of styles and designs. Contact our lab to find out what is available, but bear in mind that these glasses need to be light and comfortable, so they are suited to very light frames such as rimless frames with thin Hingeless temples allowing them to be kept in place and worn for long periods of time without any discomfort, even when engaged in violent activities.

 

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