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August 31, 2026

Ophthalmic Knives: Types, Applications & How to Choose the Right Blade

Understand the different types of ophthalmic knives, their surgical applications, blade designs, and key factors to consider when selecting ophthalmic surgical blades for eye-care and surgical procedures.

Ophthalmic Knives: Types, Applications & How to Choose the Right Blade

Ophthalmic Knives: Types, Applications & How to Choose the Right Blade

Ophthalmic knives are precision surgical blades designed for controlled incisions and tissue access during ophthalmic procedures. The geometry, tip configuration, blade width, bevel design, and overall construction can influence how a blade performs during different surgical applications.

For hospitals, ophthalmology clinics, surgical centres, distributors, and healthcare procurement teams, choosing the right ophthalmic surgical knife means understanding the differences between blade types and selecting a configuration suited to the intended procedure.

Medsprings provides a specialised portfolio of ophthalmic knives and surgical blades, including Round Stock and Flat Stock configurations designed for different anterior and posterior segment applications.

What Are Ophthalmic Knives?

Ophthalmic knives are specialised surgical blades used to create controlled incisions during eye surgery. Unlike general-purpose surgical blades, ophthalmic knives are designed around the dimensional and access requirements of delicate ophthalmic procedures.

Depending on their design, ophthalmic knives can be used for applications such as:

  • Primary corneal or limbal incisions

  • Side-port and paracentesis incisions

  • Clear-corneal approaches

  • Scleral tunnel construction

  • Incision enlargement before IOL implantation

  • Vitreoretinal port creation

  • Other specialised ophthalmic surgical access requirements

The appropriate blade depends on the surgical technique, incision requirements, instrument access, and surgeon preference.

Types of Ophthalmic Knives

There are several types of ophthalmic surgical knives, each designed for a particular incision or surgical application.

Medsprings' portfolio includes Sideport / Stab Blades, Slit / Keratome Blades, Clear Cornea Blades, Crescent / Tunnel Blades, MVR Blades, and Enlarger Blades across its Round Stock and Flat Stock ranges.

1. Slit / Keratome Blades

Keratome blades, also referred to as slit knives, are used to create primary entry tunnels for ophthalmic procedures such as phacoemulsification.

The required blade width depends on the surgical technique and the instrumentation being introduced through the incision. Medsprings' Round Stock range includes keratome blades in sizes from 1.0 mm to 3.2 mm, while the Flat Stock range includes configurations from 1.5 mm to 3.5 mm.

When selecting a keratome blade, procurement teams and surgical professionals should consider:

  • Required incision width

  • Bevel configuration

  • Surgical approach

  • Instrument compatibility

  • Blade geometry

  • Intended procedure

Explore the Ophthalmic Knives portfolio to view available configurations.

2. Sideport / Stab Blades

Sideport blades, also called stab blades, are designed to create secondary access points during ophthalmic procedures.

They can provide access for additional surgical instruments such as cannulas and other anterior-segment instruments. Medsprings offers sideport configurations with different tip angles and bevel orientations across its ophthalmic knife portfolio.

The choice of angle and configuration can depend on the surgeon's preferred technique and the required direction of surgical access.

3. Clear Cornea Blades

Clear cornea blades are designed for controlled linear incisions through the clear cornea.

Medsprings' Round Stock range includes bi-bevel clear cornea blades in sizes from 2.2 mm to 3.2 mm, while the Flat Stock range includes bi-bevel configurations in similar sizes. The Round Stock portfolio also includes a parallel-sided configuration with depth-reference markings for staged wound construction.

For procurement teams evaluating clear corneal blades, factors such as blade width, bevel configuration, incision technique, and instrument access should be considered.

4. Crescent / Tunnel Blades

Crescent blades, sometimes referred to as tunnel blades, are designed for creating scleral tunnels and related dissecting applications.

Their rounded dissecting edge allows controlled movement through tissue when constructing a tunnel. Medsprings offers Crescent / Tunnel Blades in both Round Stock and Flat Stock configurations.

These blades can be selected according to the required tunnel dimensions, blade profile, and surgical technique.

5. MVR / Vitreoretinal Blades

MVR blades, or Micro Vitreoretinal blades, are specialised ophthalmic knives used for creating precise ports in vitreoretinal procedures.

Medsprings' MVR blades are available in straight and angled configurations, with different gauge options in the Round Stock range.

Because MVR procedures can require precise access to the posterior segment, blade configuration and gauge are important considerations when selecting a vitreoretinal knife.

6. Enlarger Blades

Enlarger blades, sometimes referred to as implant keratomes, are designed to extend an existing primary incision to the required width for IOL delivery.

Medsprings' Round Stock Enlarger Blades are available in sizes including 3.5 mm, 4.0 mm, 5.1 mm, and 5.5 mm, while the Flat Stock range includes 3.5 mm, 4.0 mm, 5.2 mm, and 5.5 mm configurations.

The appropriate size should be selected according to the surgical technique, wound requirements, and IOL delivery system.

Round Stock vs Flat Stock Ophthalmic Knives

One of the key distinctions in the Medsprings ophthalmic knife portfolio is between Round Stock and Flat Stock construction.

Round Stock Ophthalmic Knives

Round Stock blades are produced from fine stainless-steel wire and are designed around a cylindrical stock geometry.

Medsprings' Round Stock range includes:

  • Crescent Knives

  • MVR Blades

  • Clear Cornea Knives

  • Keratome Blades

  • Sideport Blades

  • Enlarger Blades

The range includes different blade angles, sizes, bevel configurations, and MVR gauges to accommodate different surgical requirements.

Explore Round Stock Ophthalmic Knives →

Flat Stock Ophthalmic Knives

Flat Stock blades are produced from pre-hardened and pre-thinned stainless-steel strips and provide a slim blade profile for ophthalmic micro-incisions.

The Flat Stock range includes:

  • Sideport / Stab Blades

  • Slit / Keratome Blades

  • Clear Cornea Blades

  • Crescent / Tunnel Blades

  • Enlarger Blades

These configurations are designed to address a range of anterior-segment incision requirements.

Explore Flat Stock Ophthalmic Knives →

How to Choose the Right Ophthalmic Knife

Selecting an ophthalmic surgical blade should begin with the intended surgical application rather than the blade name alone.

1. Identify the Surgical Application

First determine whether the blade is required for:

  • Primary incision

  • Side-port access

  • Clear corneal incision

  • Scleral tunnel construction

  • Vitreoretinal access

  • Incision enlargement

Different applications require different blade configurations.

2. Select the Appropriate Blade Type

A keratome may be appropriate for primary tunnel entry, while a sideport blade is intended for secondary access. Similarly, MVR blades are designed specifically for vitreoretinal access and Enlarger Blades are used to extend an existing wound.

Understanding the intended application helps narrow down the available options.

3. Consider Blade Size

Blade width is particularly important for keratome and clear cornea applications.

Medsprings provides different blade sizes across its portfolio, allowing selection according to the required incision dimensions.

4. Consider Bevel and Tip Configuration

Bevel orientation and tip geometry can affect the way a blade enters and moves through tissue.

Depending on the product, Medsprings offers configurations such as:

  • Bevel-up designs

  • Bi-bevel configurations

  • Lance-tip designs

  • Straight and angled MVR configurations

  • Parallel-sided designs

These options allow healthcare professionals and procurement teams to identify blades according to specific surgical requirements.

5. Consider the Surgical Instrumentation

The incision should be appropriate for the instruments and technique being used.

For example, keratome width can be selected according to the required passage for phacoemulsification or irrigation/aspiration instrumentation.

6. Consider Supply and Packaging Requirements

For hospitals and distributors, procurement requirements extend beyond blade geometry.

Factors such as sterile packaging, single-use configuration, quantity per box, product documentation, and international supply support can also influence purchasing decisions.

Medsprings' knife portfolio includes sterile, single-use, full-handled configurations packaged at 10 pieces per box.

Ophthalmic Knives for Hospitals and Distributors

Hospitals and ophthalmology centres may require several ophthalmic knife configurations depending on the procedures performed and the preferences of their surgical teams.

Distributors and importers may have an additional requirement: maintaining a balanced portfolio that covers common ophthalmic surgical applications while providing different configurations for different customers.

A focused ophthalmic supply partner can help simplify this process by providing access to multiple knife categories through one product portfolio.

Medsprings supports healthcare organisations, distributors, importers, and procurement professionals seeking specialised ophthalmic surgical products and related healthcare solutions.

Why Product Range Matters When Choosing an Ophthalmic Knife Supplier

For procurement teams, the right supplier should offer more than a single blade configuration.

A broader ophthalmic knife portfolio can make it easier to source:

  • Keratome blades

  • Sideport blades

  • Clear cornea blades

  • Crescent blades

  • MVR blades

  • Enlarger blades

  • Round Stock knives

  • Flat Stock knives

Medsprings brings these configurations together within its dedicated Ophthalmic Knives portfolio, giving healthcare and distribution partners a focused range of ophthalmic surgical blades.

Ophthalmic Knives as Part of a Broader Ophthalmic Portfolio

Ophthalmic knives are one part of a wider ophthalmic product ecosystem.

Medsprings also provides access to Ophthalmic Viscosurgical Devices (OVDs), Surgical Instruments & Consumables, and Ophthalmic Equipment.

This broader portfolio allows hospitals, distributors, importers, and healthcare procurement professionals to explore complementary ophthalmic products through a focused supply partner.

Choosing an Ophthalmic Knife Supply Partner

When evaluating an ophthalmic knife supplier, healthcare organisations should consider:

  • Breadth of ophthalmic knife configurations

  • Availability of different blade sizes

  • Surgical application coverage

  • Product and technical information

  • Sterile and packaging specifications

  • International supply capabilities

  • Responsiveness to procurement enquiries

  • Ability to support long-term supply relationships

For international buyers, these factors can be just as important as the individual blade specification.

Frequently Asked Questions About Ophthalmic Knives

What are ophthalmic knives used for?

Ophthalmic knives are specialised surgical blades used to create controlled incisions and access points during ophthalmic procedures. Different blade types are designed for applications such as primary corneal entry, side-port access, scleral tunnel construction, vitreoretinal access, and incision enlargement.

What are the different types of ophthalmic knives?

Common types include keratome or slit blades, sideport or stab blades, clear cornea blades, crescent or tunnel blades, MVR blades, and enlarger blades. Medsprings provides these configurations across its Round Stock and Flat Stock ophthalmic knife ranges.

What is a keratome blade used for?

A keratome or slit blade is used to create a primary corneal or limbal entry tunnel for ophthalmic procedures. Blade width and configuration can be selected according to the surgical technique and required instrument access.

What is an MVR ophthalmic knife?

MVR stands for Micro Vitreoretinal. MVR blades are specialised ophthalmic knives designed for creating precise ports for vitreoretinal procedures. Medsprings offers straight and angled MVR configurations in its Round Stock range.

What is the difference between Round Stock and Flat Stock ophthalmic knives?

Round Stock knives use a cylindrical fine stainless-steel wire construction, an premium option while Flat Stock knives use pre-hardened, pre-thinned stainless-steel strip, cost friendly. Each range includes different configurations intended for specific ophthalmic surgical applications.

How do I choose the right ophthalmic knife?

Start by identifying the surgical application, then consider the required blade type, width, tip configuration, bevel, angle, and compatibility with the intended surgical technique and instrumentation. Hospitals and distributors should also consider packaging, product information, and supply requirements.

Explore Ophthalmic Knives from Medsprings

Medsprings provides a focused portfolio of ophthalmic surgical knives and blades covering different surgical access and incision requirements.

Explore the complete Ophthalmic Knives portfolio, compare Round Stock Ophthalmic Knives and Flat Stock Ophthalmic Knives, or contact Medsprings to discuss product and supply requirements.