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The nasal edge is the border of an eyeglass lens closest to the bridge of the nose. It is the inner-most side of the lens where it meets the frame or where the lens is drilled for rimless designs. Its shape and position are vital for the proper fit and alignment of the entire frame.
read more about nasal edge ...The thickness of the nasal edge is determined by the wearer's prescription. For people with nearsightedness, the nasal edge is the thickest part of the lens. For people with farsightedness, the nasal edge is the thinnest part, as the center of the lens is thickest.
The shape of the nasal edge affects how the lens sits in the frame.
The nasal edge is needed for lens stability and appearance. It directly affects the overall symmetry and balance of the glasses on the face. Careful edging prevents the lens from shifting, which helps avoid induced prism and maintains visual clarity.
Opticians use several techniques to reduce the appearance of a thick nasal edge in nearsighted lenses. High-index materials reduce the bulk. Opticians can also tint the edge or grind it into a specific shape to hide the thickness within the frame.
Yes, but it must still meet the minimum safety thickness required by the FDA.
It can make the lens feel heavy and increase distortion when looking far off-center.
Yes, the nasal edge position is used as a reference point to align the optical center with the patient's PD.
If your glasses are pinching the bridge of your nose or if you see a "blur" when looking toward your nose, the nasal edge thickness or "inset" may be incorrect. An optician can adjust the frame or suggest high-index materials to reduce this bulk.
The Vision Council. Frame and Lens Selection (thevisioncouncil.org). 2024.
ABDO. Ophthalmic Lens Edging (abdo.org.uk). 2023.
Optical Journal. Centration and Inset (opticaljournal.com). 2024.
Review of Optometry. Troubleshooting Frame Fit (reviewofoptometry.com). 2024.