Advantages

For patients, a safer and reversible alternative to refractive surgery:

Freedom from visual correction during the day and the ability to enjoy excellent vision to undertake all sorts of activities. Minimized allergy and dry eye problems and no more dust particles. The safety of wearing Menicon Z night lenses with maximum corneal oxygenation (hyper Dk Menicon Z material) is assured. Right and left lenses are provided in different colours to avoid mistakes.

For fitters:

Minimum investment in time and money, with no inconvenient trial set system.

Lens Design

Menicon Z Night is a reverse geometry contact lens. The base curve is responsible for flattening the central cornea and thus reducing myopia. The reverse curve is the link between the central and tangential peripheral parts of the lens.

The tear reservoir zone is located in the reverse curve, which, together with the three fenestrations, allows optimum tear exchange. The tangential curve allows adequate centration of the lens on the eye.

Fitting Assessment

Once the Menicon Z Night fit is completed, the following night the wearer should sleep while wearing the lens, and have a contact-lens consultation on the morning following the first night of lens wear.

Once the lens-fitting assessment has been completed, the lens should be removed and corneal topography performed to assess corneal changes. Although the corneal topography on the morning following the first night of overnight wear will provide valuable information about the lens fit, the results after three weeks of lens wear will dictate whether the lens fit is satisfactory

In cases of unsuccessful lens fittings that require changing the lens, the Easyfit software will process the information obtained from wearing the lens, together with the corneal topography results, in order to determine the correct new lens.

Several sample corneal topography maps taken following the wearing of Menicon Z Night.

The image on the top left shows corneal topography before lens wear, the image on the bottom reflects the topography after lens wear, and the larger image on the right shows changes in corneal topography for pre-lens vs. post-lens wear.

Optimal fitting (Bulls-eye) The sagittal depth and centration are correct, which indicates that the lens is well-fitted. Menicon Z Night shows an excellent effect of flattening the cornea and reducing myopia. The resultant visual acuity is excellent and, thus, this lens could be prescribed to the patient.
Flat fitting (Smiley face) The lens is decentred as a result of insufficient tangential angle, leading to a flat fit. This fitting results in excessive corneal flattening which, in certain cases, could induce temporary irregular astigmatism. The red semicircle appears similar to a smiley face. The Easyfit software will determine the new lens that is required.
Steep fitting (Central island) The lens is well-centered, but the sagittal depth is higher than needed, leading to a steep fit and resulting in inadequate corneal flattening and visual acuity. The Easyfit software will determine the new lens that is required.

Follow-up Visits

Follow-up visits should be conducted at the following time intervals:

• Early the morning after the first night
• In the morning after the first week
• In the mid-afternoon after three weekss
• In the mid-afternoon after two months
• In the mid-afternoon after three months
• Then, a follow-up every six months

Maintenance

Menicon recommends MeniCare Plus for daily lens cleaning, rinsing, disinfection, and inserting, and Progent for intensive weekly cleaning. For further details, please see the instructions of use for these products.

Replacement

Annually.

Packaging

Every Menicon Z Night lens is packed in an aqueous solution of polyhexamethylene biguanide.

Once the original lens vial is opened, the packing solution should be discarded, and the lens rinsed with fresh MeniCare Plus solution before insertion.