CV OPTICS Top Hc Flat Bifocal Semi Lens 4.00B/ 1.75L FT28 1.50 D70

( Brand: Cv Optics ), ( Type: Bifocal Lens ), ( Manufacturer Part Number: 4.00B/ 1.75L )

Review CV OPTICS 4.00b/ 1.75l Sf 1.50 D70 Hc Flat Top Bifocal Semi finished Lens

Introducing the CV Optics 4.00B/1.75L SF FT28 1.50D70 HC Flat Top Bifocal Semi-Finished Lens, a high-quality optical solution designed for various applications. This lens is a bifocal lens, meaning it offers two distinct focal points to accommodate both near and far vision.

The CV Optics 4.00B lens has a base curve of 4.00, which provides a slight outward curve at the edge of the lens to reduce peripheral distortion and improve comfort. The lens also features a 1.75L SF (Spherical Front Surface) design, which allows for thinner and lighter lenses as compared to conventional lenses. The FT28 designation represents the frame size, which is suitable for medium to large-sized frames.

The 1.50D70 HC (High Index, High Curvature) designation of the lens denotes its high index material, which allows for thinner and lighter lenses, making them more cosmetically appealing. The high curvature further enhances the lens's optical performance by reducing distortion and providing better optical clarity.

The flat top design of the CV Optics 4.00B lens ensures a smooth transition between the near and far vision zones, providing a more natural visual experience. The semi-finished state of the lens means that it has undergone initial processing, such as grinding and surfacing, but still requires further finishing steps, such as edging and tinting, to be completed before it can be installed in frames.

In summary, the CV Optics 4.00B/1.75L SF FT28 1.50D70 HC Flat Top Bifocal Semi-Finished Lens is a high-performance optical solution that offers excellent visual clarity and comfort. Its thin and lightweight design, combined with its flat top bifocal technology, makes it an ideal choice for those seeking optimal vision correction in a visually appealing package. However, it is essential to note that the lens is in a semi-finished state and requires further processing before it can be installed in frames.

CV Optics 4.00B/1.75L SF FT28 1.50D70 HC Flat Top Bifocal Semi-Finished Lens is a type of prescription lens designed for bifocal correction. Here are some potential pros and cons of purchasing this lens:

1. Customizable: Since this is a semi-finished lens, it can be customized according to specific prescriptions and frame sizes.

2. High-quality materials: The lens is made of high-quality materials such as HC (High-Index) glass and SF (Super-Finish) coating for excellent optical clarity and durability.

3. Flat-top design: The flat-top bifocal design provides a larger viewing area for the add power, reducing the visible line and making it easier to see both near and far objects.

4. Wide field of view: The 1.75L curvature of the lens provides a wider field of view for superior peripheral vision.

1. Expensive: Compared to finished lenses, semi-finished lenses like this one tend to be more expensive due to the customization involved.

2. Requires precise measurement: To ensure proper fit and function, the lens requires precise measurement of the frame size and lens prescription, which may require additional time and cost.

3. Potential for errors: Since the lens is custom-made, there is a higher risk of errors in the manufacturing process, which could lead to visual distortions or other issues.

In conclusion, the CV Optics 4.00B/1.75L SF FT28 1.50D70 HC Flat Top Bifocal Semi-Finished Lens offers several advantages, including high-quality materials, a flat-top bifocal design, and a wider field of view. However, it also comes with some disadvantages, such as a higher cost, the need for precise measurement, and a higher risk of errors.

If you value customization and high-quality materials, and you have the budget for it, this lens could be a good investment. However, if you are looking for a more affordable and standard lens option, you may want to consider a finished lens instead. Ultimately, the decision depends on your specific needs and preferences.

part # 400b prices

• $34.99-$36.86

specifications visionvamp:

• brand: Cv Optics
• type: Bifocal Lens
• manufacturer part number: 4.00B/ 1.75L

general visionvamp:

• condition: New
• Health Beauty > Vision Care > Low Vision Magnifiers

payments visionvamp:

• other
• credit card: Mastercard
• wallet: Paypal

returns visionvamp:

• policy: Returns Accepted
• method: Money back
• time: 30 Days
• paid by: Seller

shipping visionvamp:

• service: USPS Priority Mail, UPS 2nd Day Air, UPS Next Day Air Saver, UPS Next Day Air
• carrier: USPS, UPS
• type: Calculated
• class: Expedited, One-day
• transit: 3-8 Days
• cost: $0.00

offer visionvamp:

• options: Ship-to-home
• quantity: 1
• best offers: True
• availability: In Stock
• started: May 18, 2026
• sold: 0

seller visionvamp:

• # reviews: 8416
• rating: 99.7%

Cv Optics 4.00B Is Similar To:

• Cv Optics 6.00b/ 2.00r Sf Ft28 1.50 D70 Hc 6.00b/ 2.00r Flat Top Bifocal Semi-finished Lens (89% similar) $34.99–$36.86. (May 15th, 2026)