Easy open

Less force required to open the seal 
The Miru 1day Menicon Flat Pack requires significantly less force to open than a conventional blister pack*. 

* Menicon in-house research.

The Miru 1day Menicon Flat Pack was specifically developed to reduce the chances of contamination of the lens inner surface. When the pack is opened, the outer surface of the lens always faces up. This eliminates confusion about lens orientation and reduces the need to touch the inner surface of the lens, making it less likely that skin oil or harmful microorganisms will get trapped between the lens and the wearer's eye. 


Fibre contamination of lens surface

Even after thorough hand washing, fibres from towels used to dry the hands are a potential source of lens contamination. If a fibre adheres to the inner surface of the lens, tears alone are often unable to flush it out, resulting in lens discomfort and eye irritation. With Miru 1day lenses, such contamination is more likely to be limited to the outer surface, where fibres can be readily dislodged by blinking.


Simulated microbial contamination

Microbial contamination was simulated by "contaminating" fingers with microbe-size fluorescent beads before removing lenses from the package, and then taking fluorescence microscope photos of the central portion of each type of lens. 

When removed from their package as directed, Miru 1day lenses require less handling, reducing the risk of microbial contamination.


Microbial contamination evaluation

Fingers were contaminated with a standard sample of Staphylococcus aureus bacteria before removing lenses from the package. Inner and outer surfaces of the lenses were then cultured separately so that bacterial growth could be observed for each surface individually. On the inner surface of the Miru 1day lens, no bacterial growth was observed.

* Menicon in-house research

Lens Material

poly (HEMA-GMA) lens material

Miru 1day lenses are made from poly (HEMA-GMA), a polymer with numerous free hydroxyl radicals that naturally attract and bond with water molecules to ensure maximum wettability and moisture retention.

HEMA: 2-Hydroxyethyl methacrylate
GMA: Glycerol monomethacrylate

Miru 1day lenses bond naturally with tears because their molecular structure closely mimics the structure of oligosaccharides found in the mucous layer of the tear film.

Wettability tests

poly (HEMA-GMA) hioxifilcon A has more free hydroxyls radicals than HEMA- based polymers, ensuring higher wettability. Droplet-impact contact angle measurement tests show that Miru 1day lenses have a smaller contact angle than Menicon’s HEMA-based lenses, further contributing to high wettability.


Evaporation rate comparison tests

With most contact lenses, evaporation rates tend to increase in tandem with water content. However, this is not the case with Miru 1day. In fact, Miru 1day lenses exhibit a lower rate of evaporation than competing lenses with similar water content as well as lenses with evaporation rates lower than 72% (high water content) and 38% (low water content).

Manufacturing Technology


Miru 1day lenses are created using Menicon's proprietary CENTRAFORM spin casting and polymerization process.

Careful control of injection volume and rotation speed enables efficient spin-casting production with a precision and reproducibility equivalent to that of cast molding.

Edge profile

The CENTRAFORM process results in a smooth edge profile that helps reduce friction when the wearer blinks.


Aspherical design for clearer vision

The CENTRAFORM process makes it possible to manufacture aspherical lenses of extremely high quality.

With spherical lenses, spherical aberrations can cause blurriness because the focal point of light-rays passing through the lens varies according to the rays' distance from the lens center.

With the Miru 1day aspherical lens design, spherical aberration is minimized; light rays come together at the correct focal point to ensure a sharper, clearer view.

Environmental focus

The secondary boxes are made from recycled lens-mold plastic.

The primary packages are made from significantly less material than before.


Lens Specifications

1mm foil-wrapped package

The Miru 1day package is covered on both sides with a unique soft foil, and features an easy-open seal.

Lens package

Package front (graphic design)

Package rear (lens specifications)
Lens specifications are printed in large, easy-to-read type.

Lens specifications


Monomer hydroxyethyl methacrylate (HEMA), Glycerol monomethacrylate (GMA)

hioxifilcon A


Physical properties

Item Property Unit Measurement standard
Water content 57 % ISO18369-4
Refractive index 1.409 - ISO18369-4
Luminous transmittance 99 % ISO18369-3


Parameters range

Base curve 8.6mm, 8.4mm
Diameter 14.2mm
Center Thickness 0.10mm (-3.00D)
Power range +0.50D to +4.00D(-0.25D steps)
-0.50D to -6.00D (-0.25D steps)
-6.50D to -10.00D (-0.50D steps)


MIRU 1day Menicon Flat Pack

Design Aspherical design
Handling tint Light blue
Manufacturing CENTRAFORM process
Wearing modality Daily wear
Replacement schedule One day disposable

* Products and availability may vary by country.

Menicon America

  • 76 Treble Cove Rd, Bldg #3, North Billerica, MA 01862, USA
  • 800-636-4266