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A Flat-Top 28 bifocal lens is the most common type of lined bifocal used to correct vision. It features a distinct segment for reading located at the bottom of the lens. This segment has a flat top edge, which gives it the shape of a capital letter "D" turned on its side.
read more about flat top 28 bifocal lens ...The "Flat-Top" name comes from the shape of the reading segment. Unlike older bifocals that had a round circle for reading, this style is cut flat across the top. This design is not just for looks. The flat top allows the optical center of the reading area to be placed right at the line. This makes the transition from distance to near vision much smoother and easier for your eyes.
The number "28" refers to the width of the reading segment in millimeters. A width of 28mm is considered the industry standard. It is wide enough to allow you to read a book or a menu comfortably without having to turn your head constantly. It is also small enough to leave plenty of room at the top of the lens for your distance vision.
The FT28 is the "go-to" bifocal for a few reasons. It is the easiest lined bifocal to get used to because it has less "image jump" than round segments. "Image jump" is when an object seems to suddenly move as your eye crosses the line. The flat line minimizes this effect, making it a very comfortable choice for first-time bifocal wearers.
While 28mm is the standard, flat-top bifocals come in other sizes. You can get an FT35 (35mm wide) or even an executive bifocal, where the line goes all the way across the lens. These wider options provide a huge reading area, but they can be heavier and thicker. Your optician can help you decide if you need a wider reading zone for your specific job or hobbies.
For a bifocal to work correctly, the line must be placed at the exact right height on the lens. This measurement is called the "segment height." An optician measures from the bottom of the lens to your lower eyelid. If the line is too high, it will block your distance vision. If it is too low, you will have to strain your neck to look down into the reading area.
Yes. A Flat-Top 28 is a "lined" bifocal. You and others will be able to see the distinct D-shaped line on the lens. If you want an invisible reading area, you would need a progressive lens.
Not always. A standard bifocal only has two zones: distance and reading. It does not have an intermediate zone for a computer screen. You might find yourself tilting your head back to see the screen through the bottom segment.
Yes. In the optical world, you will often hear this lens called a D-seg, D-28, or FT28. All of these terms refer to the same D-shaped, 28mm wide bifocal style.
If you are having trouble reading small print and want a simple, cost-effective solution, ask your optician about Flat-Top 28 bifocals. They are a great option if you have tried progressive lenses (no-line bifocals) and could not adapt to the distortion. An optician can measure the placement of the segment height perfectly to match your lower eyelid.