Sofia Martinez
Flat Top 28 bifocal lenses, commonly known as FT-28, are a specialized type of corrective eyewear designed for individuals requiring assistance with both near and distance vision. The lenses feature a distinct, flat-top ‘D’ shaped segment at the bottom, measuring 28mm in width, dedicated to near vision tasks. The FT-28 bifocals offer a versatile eyewear solution with a range of lens options, including clear, Transition Gray, Transition Brown, polarized sun lenses, and fixed tints. In terms of materials, FT-28 lenses can be made from CR-39, Trivex, polycarbonate, high-index plastic, or glass. The high-index plastic FT-28 lenses are thinner and lighter than traditional materials, making them suitable for individuals with stronger prescriptions.
| Characteristics | Values |
|---|---|
| Lens type | Bifocal |
| Lens width | 28mm |
| Lens shape | Flat top |
| Lens material | High-index plastic |
| Lens quality grade | Standard or lowest tier grade |
| Refractive index | 1.67 |
| Lens features | UV protection, scratch guard, anti-glare coating |
| Lens tint | Clear, transition, grey, brown, polarized |
| Lens style | Eyeglasses, sunglasses, safety glasses |
| Lens coatings | Anti-fog, anti-reflective |
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What You'll Learn
Lens materials
Flat Top 28 bifocal lenses, commonly known as FT-28, are a specialized type of corrective eyewear designed for individuals requiring assistance with both near and distance vision. These lenses are characterized by a distinct, flat-top 'D' shaped segment at the bottom, measuring 28mm in width, dedicated to near vision tasks.
When it comes to lens materials, FT-28 bifocals offer a range of options to meet specific needs and preferences. Here are some commonly used lens materials for FT-28 bifocal lenses:
CR-39
CR-39 is a type of plastic that serves as the standard glasses lens material. It is lightweight, impact-resistant, and provides excellent optical clarity. CR-39 lenses offer great vision correction for refractive errors and block out 80% of UV light. They are also more durable and less likely to shatter compared to glass lenses.
Trivex
Trivex lenses are known for their exceptional clarity, impact resistance, and lightweight properties. They offer a balance between comfort and durability, making them a versatile choice for FT-28 bifocal wearers.
Polycarbonate
Polycarbonate lenses are highly impact-resistant, thin, and lightweight. They provide superior protection and are ideal for safety eyewear, sports glasses, and daily use. These lenses are a popular choice for active individuals and those seeking durability.
High-Index Plastic
High-index plastic lenses have a higher refractive index, resulting in thinner and lighter lenses compared to traditional materials. They are an excellent option for individuals with stronger prescriptions who prefer a more aesthetically pleasing appearance. High-index lenses also offer superior optics, impact resistance, and UV protection.
Glass
Glass lenses provide visual clarity and are highly scratch-resistant. However, they tend to be heavier, thicker, and have lower impact resistance. Glass lenses are also more expensive and may not be compatible with all frame designs due to their complexity and impact-resistant regulations.
The choice of lens material for FT-28 bifocals depends on factors such as visual needs, comfort, durability, and personal style. It is important to consider daily activities and specific requirements to make an informed decision when selecting the most suitable lens material.
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Lens options
FT-28 bifocals offer a wide range of lens options to cater to diverse needs and preferences. The versatility of these lenses allows for clear distance and near vision correction, ensuring a seamless visual experience.
The most common lens options for FT-28 bifocals include clear lenses, transition lenses, and polarized lenses. Clear lenses offer crystal-clear vision under standard lighting conditions, providing the full spectrum of light for the best possible colour perception. Transition lenses, on the other hand, are adaptive and automatically adjust their tint based on lighting conditions, offering clear vision both indoors and outdoors. Polarized lenses are an excellent choice for reducing glare, especially when driving or spending time near water or other reflective surfaces.
FT-28 bifocals also provide the option of specialized lenses, such as Transition Gray, Transition Brown, and Drivewear lenses. Transition Gray and Brown lenses offer a stylish alternative to traditional clear lenses while still providing the benefits of adaptive tinting. Drivewear lenses are designed with drivers in mind, featuring a unique yellow to dark red-brown tint that enhances contrast and reduces glare, making it easier to see the road and potential hazards.
In addition to these options, FT-28 bifocals can be customized with fixed tints, allowing you to choose a colour that complements your style and enhances your appearance. Whether you prefer a subtle tint or a bold statement colour, the variety of fixed tint options available ensures you can find the perfect match.
FT-28 bifocal lenses are also available in different materials, including CR-39, Trivex, Polycarbonate (Poly), and High-Index Plastic. Each material offers unique benefits, such as impact resistance, lightweight comfort, and superior protection, ensuring that you can find the ideal lens that balances functionality and aesthetics.
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Lens coatings
One of the most common lens coatings is the anti-reflective coating, also known as AR coating or anti-glare coating. This microscopically thin multi-layer coating eliminates reflections from the front and back surfaces of eyeglass lenses, making them nearly invisible. This allows people to focus on the wearer's eyes, rather than distracting reflections. It also removes glare caused by light reflecting off the lenses, improving vision for night driving and making reading and computer use more comfortable. AR coating is highly recommended for polycarbonate and high-index lenses, which reflect more light than regular glass or plastic lenses. Additionally, it is beneficial for aspheric lenses, which have flatter curves and tend to cause more noticeable reflections.
Another type of lens coating is the scratch-resistant hard coat, which makes the lens surface harder and more resistant to scratches. Most eyeglass lenses nowadays, including high-index lenses and polycarbonate and Trivex lenses, have a built-in scratch-resistant coating. However, since scratch-resistant coatings are sometimes optional, it is important to specify that you want this coating included.
Other coatings include CleanCoat, which makes the lens surface smoother, making it more difficult for dirt and dust to adhere, and an invisible dye that blocks ultraviolet (UV) light, providing added protection for the eyes against cataracts, retinal damage, and other eye problems.
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Frame styles
Flat Top 28 bifocal lenses, commonly known as FT-28, are a type of bifocal lens with two distinct areas for vision correction. The upper portion of the lens is designed for distance vision, while the lower part, or bifocal segment, is dedicated to near vision tasks such as reading or close-up work. This segment typically measures 28mm in width and is characterised by a flat-top 'D' shape.
FT-28 bifocals offer versatility in terms of style, as they can be fitted into a diverse range of frame designs. Whether you prefer classic or contemporary aesthetics, you can choose frames that complement your personal style while meeting your visual needs. This flexibility ensures that functionality and fashion go hand in hand.
When selecting frames for your FT-28 bifocal lenses, you have a variety of options to choose from. You can opt for eyeglasses, sunglasses, or safety glasses frames, depending on your specific requirements and preferences.
Additionally, you can consider the frame style that suits your facial features and enhances your overall appearance. Frames come in different shapes, sizes, and colours, allowing you to customise your eyewear to your unique taste. You can explore various frame styles, such as classic aviators, sleek rectangular frames, or trendy round shapes, to find the perfect match for your FT-28 bifocal lenses.
Furthermore, you can also choose between different frame materials. Plastic frames, for example, are lightweight and durable, making them a popular choice for everyday wear. Metal frames, on the other hand, offer a more sophisticated look and feel, providing a stylish option for those who want a more elegant appearance.
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Vision correction
Flat Top 28 bifocal lenses, commonly known as FT-28, are a type of corrective eyewear designed for individuals requiring assistance with both near and distance vision. These lenses feature a distinct flat-top 'D'-shaped segment at the bottom, dedicated to near vision tasks like reading or computer work. The segment is 28mm in width and seamlessly integrates into the rest of the lens, which is optimised for distance vision. The clear demarcation line between the two areas makes it easier for wearers to adjust their focus when transitioning between different visual tasks.
FT-28 bifocals offer a versatile solution and can be customised to meet specific needs and preferences. They are available in a range of lens materials, including CR-39, Trivex, polycarbonate, high-index plastic, and glass. Each material offers unique advantages in terms of clarity, impact resistance, weight, and protection. For example, high-index plastic lenses are thinner and lighter, making them suitable for higher prescriptions.
In addition to lens materials, FT-28 bifocals offer various lens options such as clear, Transition Gray, Transition Brown, polarised sun lenses, and fixed tints. Wearers can also choose from different frame designs, ensuring that their eyewear not only meets their visual needs but also complements their personal style.
FT-28 bifocals provide several benefits for eye health and safety. The clear division between the near and distance vision segments reduces eye strain associated with continuously adjusting focus, making them beneficial for individuals prone to eye fatigue or digital eye strain. Furthermore, FT-28 bifocals can be incorporated into protective eyewear for those working in environments where eye protection is crucial.
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Frequently asked questions
FT-28 bifocal lenses, also known as Flat Top 28 bifocals, are a type of corrective eyewear designed for individuals requiring assistance with both near and distance vision. The lenses have a distinct flat-top ‘D’ shaped segment at the bottom, measuring 28mm in width, dedicated to near vision tasks.
FT-28 bifocals offer a versatile eyewear solution with a clear division between the near and distance vision segments, reducing eye strain. They are easy to adapt to and are compatible with a wide range of frame styles, catering to diverse aesthetic preferences. They are also cost-effective, with a wide reading area, making them ideal for reading, computer work, or crafting.
FT-28 bifocal lenses can be made from various materials, including CR-39, Trivex, Polycarbonate (Poly), High-Index Plastic, and Glass. Each material offers different advantages in terms of clarity, impact resistance, weight, and protection.
You can purchase FT-28 bifocal lenses from online retailers such as RX Safety, VS Eyewear, and Go-Optic. These websites offer a wide range of frame styles and lens options to choose from, ensuring you find the perfect eyewear solution to meet your unique vision needs.
