Silver Line Laboratories
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Contact lens manufacturer · Delhi, India

Specialistcontact lenses,precision-madein Delhi.

Proudly Made in India

Advancing speciality contact lens manufacturing from India, with a focus on precision, quality and innovation.

Discover how it’s made
02Process

Discover How It’s Made.

McAsfeer* — Multi-Curve Back-Aspheric Lens Geometry

At Silver Line Laboratories, lens design goes beyond simply selecting a base curve. McAsfeer* represents our approach to advanced lens geometry, where every curve, transition and surface profile is carefully considered to meet diverse optical and fitting requirements.

Our expertise lies in developing and refining different lens geometries to accommodate a wide range of corneal shapes, prescriptions and individual needs. From back-aspheric soft and rigid gas permeable lenses to advanced scleral designs and reverse-geometry Orthokeratology lenses, each design brings its own possibilities for customisation.

By combining versatile design capabilities with precision CNC manufacturing, we create contact lens solutions that go beyond conventional fitting parameters, with attention to individuality, accuracy and the finer details of lens design.

McAsfeer* multi-curve back-aspheric geometryTop: one lens back surface built from several curves, central, mid-peripheral, peripheral and edge. Bottom: the same design approach applied to four lens geometries: soft, rigid gas-permeable, scleral and reverse-geometry Ortho-K. Shapes only; not to scale and no values.CENTRALMID-PERIPHERALPERIPHERALEDGESOFTRGPSCLERALORTHO-KNOT TO SCALE
GeometrySeveral curves make up one back surface; the approach carries across soft, RGP, scleral and Ortho-K designs.
58 seconds · no sound · the captions are part of the film
  1. 01

    Blank mounting

    A lens blank is secured in the lathe collet, ready for cutting.

  2. 02

    Back surface cutting

    The lathe cuts the diameter, then roughs and finishes the back surface and the back edge: the side that sits towards the eye.

  3. 03

    Transfer blocking

    The part-made lens is transferred to a new holder, preparing it for front cutting.

  4. 04

    Front surface cutting

    The front surface is roughed and then finished. The film closes on the back-curve profile and the finished toric haptic lens.

From blank to lensOne lens, three moments.A lens blank, a blank part-way through cutting, and a finished lens.
Three objects on a white surface, left to right: a solid blue lens blank, a blank part-way through cutting, and a finished blue lens
Why Silver Line

What practitioners get from us.

The seven points the company stands behind, from its own “Why choose us” sheet.

  • 01

    Decades of experience

    A legacy of contact lens manufacturing since 1991.

  • 02

    Precision manufacturing

    Advanced technology and meticulous production processes.

  • 03

    Custom lens solutions

    Specialised solutions for individual vision requirements.

  • 04

    Speciality lens portfolio

    An extensive range of conventional and speciality contact lenses.

  • 05

    Quality-focused processes

    Attention to material selection, consistency and inspection.

  • 06

    Dedicated support & service

    Product guidance and assistance for eye care professionals and lens wearers.

  • 07

    Complete lens care solutions

    A comprehensive range of contact lens care products supporting proper cleaning, maintenance and everyday lens care.

03FAQ

Frequently Asked Questions

Answers to the questions patients and parents ask most about contact lenses, Ortho-K and scleral lenses. Your eye care practitioner will advise on your own eyes.

See all questions
Are contact lenses safe?
Yes. Contact lenses are generally safe when prescribed, fitted and cared for correctly. Poor hygiene, sleeping in lenses that are not prescribed for overnight wear, and wearing lenses longer than directed can increase the risk of infection or other eye problems.
Can I wear contact lenses every day?
Often, yes. Many lenses are intended for daily use, provided your eyes remain healthy and you follow the prescribed wearing and replacement schedule. Your practitioner will advise how many hours to wear them and when to take breaks.
Can I swim or shower with contact lenses?
No. Remove contact lenses before swimming, showering and using hot tubs. Water can carry microorganisms that may cause serious eye infections. Prescription swimming goggles may be a safer alternative for water activities. Scleral lenses are the one exception for showering: see “Can I take a shower with my scleral lenses on?”.
What is Ortho-K and how does it work?
Orthokeratology (Ortho-K) uses specially designed rigid gas permeable lenses, usually worn during sleep, to temporarily reshape the front surface of the eye (the cornea). The lenses are removed after waking, allowing many patients to see more clearly during the day without glasses or daytime contact lenses.
Is Ortho-K safe for children?
Ortho-K may be appropriate for carefully selected children when professionally fitted and monitored. However, sleeping in contact lenses increases the risk of corneal infection, which can sometimes threaten vision. Strict hygiene, parental supervision when needed, and regular follow-up visits are essential.
How do scleral lenses work?
Most contact lenses sit on the corneal surface itself. Scleral lenses are larger and wider, resting on the sclera (the white part of the eye). The lens then vaults over the cornea, leaving a fluid-filled chamber between the lens and the surface of the eye. This design helps hydrate the eye and compensates for irregularities in the shape of the corneal surface.
Are scleral lenses comfortable?
Initially, there may be a sense of awareness with scleral lenses, or “knowing that the lens is there”. It can take some time to acclimate to this feeling, especially if you have never worn a contact lens before. In the long run most patients report that scleral lenses are more comfortable than other types of rigid lenses, to the point where they are hardly noticeable. The design of scleral lenses helps reduce corneal irritation and keeps the eye hydrated and healthy. They are also custom-designed to fit the unique shape of each individual eye, factors that provide for all-day comfort. While some specialty contact lenses are suitable to wear overnight, scleral lenses are not. It is advised to remove them before going to bed each night.
Can I take a shower with my scleral lenses on?
For scleral lenses only: yes, but try to avoid it if not necessary. Regular contact of water with your lenses may invite deposition on the lens surface and may affect lens performance.
04Partnerships

Academic & Institutional Partnerships

Collaborations with academic institutions and professional education organizations to encourage learning, knowledge exchange and the development of future eye-care professionals.

  • GD Goenka UniversityGurugram, Haryana
  • Sushant UniversityGurugram, Haryana
  • Noida International UniversityGreater Noida, Uttar Pradesh
  • Amity University HaryanaGurugram, Haryana
  • Swami Vivekanand Subharti University (Subharti)Meerut, Uttar Pradesh
  • SGT UniversityGurugram, Haryana
  • NSHM Knowledge Campus, DurgapurDurgapur, West Bengal
  • Swami Vivekananda University, West BengalBarrackpore, West Bengal
  • T.S. Mishra UniversityLucknow, Uttar Pradesh
  • CGC UniversityMohali, Punjab
  • Trilochan Netralaya – School of OptometrySambalpur, Odisha
  • Bareilly International UniversityBareilly, Uttar Pradesh
  • Arka Jain UniversityJamshedpur, Jharkhand
  • Teerthanker Mahaveer UniversityMoradabad, Uttar Pradesh

14 institutions

Education
PDF For eye care professionals and institutions

CLEAR™ Fellowship Program

The CLEAR™ (Contact Lens Education and Resources) Speciality Contact Lens Fellowship Program: mission, vision, experiential learning, what the fellowship fee includes, and the fellowship record form.

PDF · 7 pages · 6.7 MB Download the CLEAR Fellowship PDF
05Reviews

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06Enquiry

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