Numbers such as 52 □ 18 – 140 are a useful starting point when comparing eyeglass frames. This guide explains lens width, bridge width and temple length, why identical numbers can still fit differently, and when professional measurements matter for comfortable prescription glasses in Kathmandu.
Most frame markings use millimetres. In the example 52 □ 18 – 140, 52 is usually the width of one lens opening, 18 is the bridge width, and 140 is the temple length. The small square separates lens and bridge measurements. Some manufacturers print the numbers in a different order or add a model name, colour code, lens height or frame code.
| Example | Measurement | What it describes | Why it matters |
|---|---|---|---|
| 52 mm | Lens width | Horizontal width of one lens opening | Influences overall frame width and lens size |
| 18 mm | Bridge width | Distance across the bridge area | Affects how the frame rests on the nose |
| 140 mm | Temple length | Length of the side arm | Affects the position and bend behind the ear |
A previous frame that fits well can provide a helpful reference, but it should not be treated as a complete prescription for the next frame. For practical help choosing prescription glasses in Kathmandu, professional fitting remains important.
Two frames marked 52–18–140 may feel very different. Lens shape, rim thickness, hinge position, curvature, nose-pad design, material flexibility and temple angle all affect the final fit. A round 52 mm lens and a rectangular 52 mm lens also distribute width differently across the face.
Bridge numbers are especially easy to misinterpret because a moulded plastic bridge and adjustable nose pads do not sit on the nose in the same way. Face width, nose shape and the position of the ears matter alongside the printed measurements.
For some higher prescriptions, a smaller and well-centred frame may help reduce unnecessary lens thickness and weight. The result also depends on prescription strength, pupillary distance, lens material, frame shape and lens design. A frame should therefore be selected together with suitable lens advice rather than from size numbers alone.
Vision Concern offers guidance on high-index ultra-thin prescription lenses. No thickness or cosmetic result can be guaranteed before the prescription, measurements, frame and lens specifications are reviewed.
Progressive lenses require more than the numbers printed on a frame. The frame must sit naturally before monocular pupillary distance, fitting height and other dispensing measurements are taken. Lens depth, frame position and the selected progressive design can affect the usable viewing zones.
If you are considering multifocals, review Vision Concern’s progressive lenses in Kathmandu. Bring your current pair and prescription when possible so the optometry and optical team can understand your previous experience.
Travellers can save time by photographing both the spectacle prescription and the numbers printed inside the temple before visiting. Include a front-facing photo of the current glasses if you want the team to understand their general shape and fit. Do not rely only on an online frame-size chart when ordering prescription lenses, especially if you use progressives, prism, a high prescription or an unfamiliar frame style.
Visitors may also find these resources useful: eye care for tourists and expats and using a foreign eyeglass prescription in Nepal. Availability and completion time depend on the frame, prescription, lens design, coatings, measurements and current supply.
Published by: Yadav Raut, Consultant Optometrist, M.Optom–Norway
Reviewed by: Shreena Prajapati
| Branch | Location | Phone |
|---|---|---|
| Lazimpat | Das Tower, near Shangri-La Hotel | 01-4543117 |
| Boudha-Tushal | Opposite KFC, Boudha | 01-4562303 |
| Makalbari | Pragati Chowk, Gokarneshwor | 01-5134042 |
Google: Boudha · Lazimpat · Makalbari
TripAdvisor: Boudha · Lazimpat · Makalbari
WhatClinic: Boudha · Lazimpat · Makalbari
Send your frame numbers and prescription before visiting, or contact the nearest branch. Suitability, stock and completion time are confirmed only after review.
WhatsApp +977 9841466716 Tap to CallVision Concern offers:
Yes.
If your frame is in good condition, we can replace only the prescription lenses with options including:
Many international insurance providers may reimburse eye examinations or prescription eyewear depending on the policy. We recommend checking with your insurer before your visit, and we can provide invoices and supporting documentation when required.
