EP3877787A1

EP3877787A1 - Contact lens with a surface coating, and manufacturing method

Info

Publication number: EP3877787A1
Application number: EP19805526.1A
Authority: EP
Inventors: Mohammed Es-Souni
Original assignee: Fachhochschule Kiel
Current assignee: Fachhochschule Kiel
Priority date: 2018-11-07
Filing date: 2019-11-06
Publication date: 2021-09-15
Also published as: DE102018127812A1; WO2020094185A1; DE102018127812B4

Abstract

The invention relates to a contact lens with a surface coating, the surface having a contact angle, relative to water or aqueous solutions as the liquid, of less than or equal to 30°, and the contact angle being isotropic relative to a surface of more than 50 μm². The invention also relates to a method for manufacturing a contact lens with a surface coating.

Description

Contact lens with a surface coating and manufacturing process

The invention relates to a contact lens with a surface coating to improve the hydrophilicity of the surface, and to a method for producing the contact lens with a surface coating.

Coatings for hydrogel (not RGP) contact lenses for the purpose of improving the hydrophilicity are known from the following documents.

DE 602 19 318 T2 describes a hydophilic coating for hydrogel contact lenses, which i.a. generated via photopolymerization, the AFM (atomic / scanning force microscope) images show non-periodic mean peak roughness of the resulting layer.

In DE 601 15 218 T2, multiple coating of hydrogel-silicone contact lenses leads to the generation of a non-periodic topography.

US Pat. No. 6,213,604 B1 achieves an improved hydrophilicity of the surface of silicone hydrogel contact lenses by coating by generating non-periodic roughness by means of plasma oxidation.

US 2016/0097939 A1 deals with "worm-like" nano-textures on hydrogel contact lenses for the purpose of improving the hydrophilicity of the surface.

For hard RGP contact lenses, the following surface modifications are and

Coatings known to improve hydrophilicity.

US 2016/0320635 A1 claims a contact lens with a covalently attached

Hydrogel layer of uniform thickness, which is generated from two types of highly branched macromers via nucleophilic addition.

From US 2006/0142410 A1 discloses a safe eyepiece lens material with high

Oxygen permeability, excellent surface wettability, the excellent lubricity / easy lubrication property of the surface, little surface adhesive and superior flexibility and stress relaxation, it also suppresses the elution of a monomer from the final product, which refers to an eyepiece lens material that has at least one type of compound (A) an ethylenically unsaturated group and a polydimethylsiloxane structure through a urethane bond and at least one type of

Pyrrolidone derivative (B) in which a polymerizable group is a methylene group.

DE 602 23 589 T2 claims hydrophilic surfaces produced by photo-induced graft polymerization, even on hard contact lenses. The thicknesses of the layers are advertised as homogeneous, there is no evidence of a periodic structure on the surface. EP 2 458 427 B1 describes a contact lens with a periodic, wave-like structure, the structure being produced by ablation using a pulse laser. The resulting one

Topography, which has dimensions of up to 20pm, leads to an only weakly hydrophilic rather hydrophobic surface with a strongly direction-dependent contact angle between 30 ° and 125 °.

To prevent the growth of epithelial cells and antimicrobials on contact lenses, US Pat. No. 7,083,646 B2 proposes coating the contact lenses with polymers which contain functional groups, such as carboxy or hydroxyl groups, anhydrides or epoxides.

EP 1 346 021 B1 proposes a method for inhibiting the ability of an ophthalmic lens to sorb cationic antimicrobials, which involves treating the surface of the lens with a cationic polysaccharide.

Against this background, it is an object of the invention to have a contact lens

To provide surface coating that is permanent and independent of direction

Has hydrophilicity with a contact angle of <30 °.

Furthermore, it is an object of the invention to provide a contact lens with a surface coating which can reduce the growth of bacteria.

The object of the invention is achieved by a contact lens with a

Surface coating, the surface having a contact angle based on water or aqueous solutions as a liquid of less than or equal to 30 ° and the contact angle based on an area of more than 50 × 50 μm ^{2 being} direction-independent.

In one embodiment, the object of the invention can in particular be further achieved by a contact lens with a surface coating, characterized in that the surface coating on the surface has a periodic, wave-like topography with a wavelength (W) between 70 and 200 nm, preferably between 80 and 180 nm , particularly preferably between 80 and 160 nm and an amplitude (A) between 5 and 20 nm, preferably between 6 and 18 nm, particularly preferably between 7 and 16 nm, and the domain sizes of the regions of the same orientation have a size of 5 × 5 pm ² up to 50 x 50 pm ² .

In one embodiment, the object of the invention can be achieved by a contact lens with a surface coating, the contact angle remaining in contact with aqueous media over a period of 14 days remaining less than or equal to 30 °.

In a further embodiment, the object of the invention can be achieved by a contact lens with a surface coating, the surface coating leading to a reduction in the growth of bacteria on the surface. In one embodiment, the object of the invention can be achieved by a contact lens with a surface coating, the surface coating being a covalently bonded layer.

In a further embodiment, the object of the invention can be achieved by a contact lens with a surface coating, wherein it is in the

Surface coating is a layer containing poly- and oligomers of acrylamides and / or acrylates and / or methacrylates.

In a particular embodiment, the object of the invention can be achieved by a contact lens with a surface coating, wherein it is in the

Surface coating is a layer containing poly- and oligomers of zwitterionic acrylamides and / or acrylates and / or methacrylates.

In one embodiment, the object of the invention can be achieved by a

Contact lens with a surface coating, the contact lens being an RGP contact lens.

In a further aspect, the object of the invention can be achieved by a method for producing a contact lens with a surface coating comprising the steps:

I. Pretreatment of an uncoated contact lens using an oxygen plasma treatment;

II. Silanizing the pretreated surface;

III. Drying the contact lens treated with the silane primer;

IV. Applying the photopolymerization initiator for later polymerization;

V. applying the dissolved monomer;

VI. Covering the solution;

VII. Expose the solution for 40 to 90 seconds;

VIII. Turn off the light source and let the solution rest for 2 minutes;

IX. Repeating the exposure step VII and step VIII and 2 to 4 times

X. Rinsing the surface coated contact lens.

In step II, the silanization can preferably take place in the vapor phase, temperatures between 40 ° C. and 55 ° C. being particularly preferred.

Silanization or silanization (step II) is understood to mean the attachment of a silane compound of the general formula R _m SiX _n with m + n = 4. Where X represents a hydrolyzable group, which can form a connection, for example, with OH groups on the pretreated surface of the contact lens in a condensation reaction. X is preferably an alkoxy group, chloride and / or bromide, the alkoxy group being particularly preferred Is methoxy, ethoxy and / or propoxy. The organic radical R consists of a branched or unbranched alkyl chain and bears a group which is the later covalent

Connection of the monomers / oligomers enabled. The group is preferably an acrylic or methacrylic group.

Step III can be carried out under reduced pressure and at temperatures between 20 and 45 ° C.

Polymerization initiators that can be activated by irradiation with light are

Known to those skilled in the art as photopolymerization initiators.

It is also known to the person skilled in the art that some photopolymerization initiators, in particular those of the so-called type 2 (e.g. benzophenone), use co-initiators such as amines or alcohols, in particular e.g. Triethylamine, iso-propanol and ethanol, which trigger the radical formation by hydrogen transfer, require.

The photopolymerization initiators are preferably selected from the group of

Acetophenones, benzoins, benzene derivatives, benzophenones, quinones, thoiaxanthones and / or salts.

The photopolymerization initiators can be selected from the group: 2-benzyl-2- (dimethylamino) -4'-morpholinobutyrophenone, 4'-tert-butyl-2 ', 6'-dimethylacetophenone, 2,2-diethoxyacetophenone, 2,2- Dimethoxy-2-phenylacetophenone, diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide / 2-hydroxy-2-methylpropiophenone, 4'-ethoxyacetophenone, 3'-hydroxyacetophenone, 4'-hydroxyacetophenone, 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-4 '- (2-hydroxyethoxy) -2-methylpropiophenone, 2-hydroxy-2-methylpropiophenone, 2-methyl-4'- (methylthio) -2-morpholinopropiophenone, 4'-phenoxyacetophenone, benzoin, benzoin ethyl ether, benzoin methyl ether, 4,4' -Dimethoxybenzoin, 4,4'-dimethylbenzil, benzophenone,

Benzophenone-3,3 ', 4,4'-tetracarboxylic dianhydride, 4-benzoylbiphenyl, 4,4'-bis (diethylamino) benzophenone, 4,4'-bis [2- (1-propenyl) phenoxy] benzophenone, 4 - (Diethylamino) benzophenone, 4,4'-dihydroxybenzophenone, 4- (dimethylamino) benzophenone, 3,4-dimethylbenzophenone, 3-hydroxybenzophenone, 4-hydroxybenzophenone, 2-methylbenzophenone, 3-methylbenzophenone, 4-methylbenzophenone, methylbenzoyl format Ketone, bis (4-tert-butylphenyl) iodonium perfluoro-1-butanesulfonate, bis (4-tert-butylphenyl) iodonium p-toluenesulfonate, bis (4-tert-butylphenyl) iodonium triflate, boc-methoxyphenyldiphenylsulfonium trynoxycarbonyl (tertiary) diphenylsulfonium triflate, (4-tert-butylphenyl) diphenylsulfonium triflate,

Diphenyl iodonium hexafluorophosphate, diphenyl iodonium nitrate, diphenyl iodonium perfluoro-1-butanesulfonate, diphenyl iodonium p-toluenesulfonate, diphenyl iodonium triflate, (4-fluorophenyl) diphenyl sulfonium triflate, N-hydroxynaphthalene norbornene triflate 2,3-dicarboximide perfluoro-1-butanesulfonate, (4-iodophenyl) diphenylsulfonium triflate, (4-methoxyphenyl) diphenylsulfonium triflate, 2- (4-methoxystyryl) -4,6-bis (trichloromethyl) -1, 3,5-triazine, ( 4-methylphenyl) diphenylsulfonium triflate, (4-

Methylthiophenyl) methylphenylsulfonium triflate, 1-naphthyl diphenylsulfonium triflate, (4-phenoxyphenyl) diphenylsulfonium triflate, (4-phenylthiophenyl) diphenylsulfonium triflate,

Triarylsulfonium hexafluoroantimonate, triphenylsulfonium perfluoro-1-butanesulfonate, triphenylsulfonium triflate, tris (4-tert-butylphenyl) sulfonium perfluoro-1-butanesulfonate, tris (4-tert-butylphenyl) sulfonium triflate, anthraquinone-2-monohydrate-2-anthraquinone Capherquinone, diphenyl (2,4,6-tri ethylbenzoyl) phosphine oxide, 9,10-phenanthrene quinone, phenyl bis (2,4,6-tri ethyl benzoyl) phosphine oxide, 1-chloro-4-propoxy-9H-thioxanthen-9-one , 2-chlorothioxanthen-9-one, 2,4-diethyl-9H-thioxanthen-9-one, isopropyl-9H-thioxanthen-9-one, 10-methylphenothiazine, thioxanthen-9-one.

In principle, the photoinitiator and the wavelength of the light source used for the polymerization must be matched to one another, this information being available to the person skilled in the art.

Steps IV. Application of the photopolymerization initiator and V. Application of the dissolved monomer can be carried out separately (then first step IV. Then V.) or together by mixing the two solutions together shortly beforehand.

The monomers used are those which can be converted into hydrophilic polymers; this information is likewise generally known to the person skilled in the art.

The monomers are preferably selected from the group of acrylates, methacrylates and / or acrylamides. In a special embodiment, the monomers can be selected from the group of zwitterionic acrylates, methacrylates and / or acrylamides.

Mixtures of the monomers can also be used.

The monomers are particularly preferably selected from the group consisting of acrylamide (AM),

Hydroxypropyl methacrylamide (HPMAA), diethylene glycol methyl ether methacrylate (DEGMA), diethylene glycol ethyl ether methacrylate (DEGMA-EE), triethylene glycol methyl ether methacrylate (TEGMA), triethylene glycol ethyl ether methacrylate ( TEGMA-EE), oligo-ethylene glycol-methyl-ether-methacrylate (OEGMA), oligo-ethylene-glycol-ethyl-ether-methacrylate (OEGMA-EE), poly-ethylene-glycol-methacrylate (PEGMA), poly-ethylene-glycol-methyl-ether- methacrylate (PEGMA-ME), poly-ethylene glycol methyl ether methacrylate (PEGMA-EE), ethylene glycol methyl ether styrene (SPEG-ME), ethylene glycol ethyl ether styrene (SPEG-EE), hydroxyethyl methacrylate (HEMA), hydroxypropyl methacrylate (HPMA), sulfobetaine methacrylate (SBMA), sulfobetaine acrylate (SBA), carboxy betaine methacrylate (CBMA), carboxy betaine acrylate (CBA), cysteine methacrylate monomer (CysMA), cysteine acrylate monomer (CysA), N- (2-methacryloyloxy) ethyl-N, N- dimethylammoniopropanesulfonate (SPE), N- (2-acryloyloxy) ethyl-N, N-dimethylammoniopropanesulfonate, N- (3-methacryloylimino) propyl-N, N-dimethylammoniopropanesulfonate (SPP), N- (3-acryloylimino) propyl-N, N - dimethylammoniopropanesulfonate (SPP), 2- (methacryloyloxy) ethylphosphatidylcholine (MPC), 2- (acryloyloxy) ethylphosphatidylcholine (APC), 3- (2'-vinyl-pyridinio) propanesulfonate (SPV), N, N-diethyl-N-methacryloylethyl -N- (3-sulfopropyl) ammonium betaine (SPEE), N, N-diethyl-N-acryloylethyl-N- (3-sulfopropyl) ammonium betaine, N, N-dimethyl-N-methacryloyloxyethyl-N- (2nd - sulfoethyl) ammonium betaine (SEE), N, N-dimethyl-N-acryloyloxyethyl-N- (2-sulfoethyl) ammonium betaine (SEE), N, N-di-n-butyl-N-methacryloylethyl-N- (3rd - sulfopropyl) ammonium betaine (SPEB), N, N-di-n-butyl-N-acryloylethyl-N- (3-sulfopropyl) ammonium betaine, N, N-di-n-butylaminoethyl methacrylate (DBAEMA), N, N- Di-n-butylaminoethyl acrylate (DBAEA), N, N-dimethyl-N-methacryloyloxyethyl-N- (4-sulfobutyl) ammonium betaine (SBE), N, N-dimethyl-N-acryloyloxyet hyl-N- (4-sulfobutyl) ammonium betaine.

The solution of step VI can easily be covered with a coverslip.

Depending on the effective wavelength range of the photopolymerization initiator, white light emitters or emitters can be used in the overall visible range to carry out the photopolymerization step VII.

The photopolymerization initiator used must be matched to the wavelength of the light used for the irradiation.

Surprisingly, it was found that the method according to the invention can be used to produce contact lenses with a surface coating that has a permanent coating

Have hydrophilicity on the surface if, after step VII of exposure, a "rest phase" step VIII is introduced and if the exposure (step VII) and the rest (step VIII) are then repeated two to four times, so that the step VII (exposure) is carried out 3 to 5 times.

Figure 1 shows the image of an inventive contact lens (in this case, an RGP contact lens) with a surface coating, generated with an atomic force microscope (AFM) (device: nanowizard 3, JPK Instruments, Berlin), after the production method according to the invention has been carried out. Acrylamide was used as the monomer. Exposure step VII was carried out 5 times. Figure 2 shows the picture at higher magnification.

A periodic, wave-like topography with one appears on the surface

Wavelength (W) between 70 and 200 nm, preferably between 80 and 180 nm, particularly preferably between 80 and 160 nm and an amplitude (A) between 5 and 20 nm, preferred between 6 and 18 nm, particularly preferably between 7 and 16 nm, the domain sizes of the regions of the same orientation having a size of 5 × 5 pm ² up to 50 × 50 pm ² .

For comparison, Figure 3 shows the same RGP contact lens after the oxygen plasma treatment (step I). Figure 4 shows the AFM image of the RGP contact lens after a single exposure (step VII).

There are no periodic or undulating topographies in Figure 3 and Figure 4. In this constellation, the topography according to the invention only forms after 5 illuminations.

Table 1 shows the results of the determination of the contact angle (device: OCA20

Contact angle microscope, Data Physics Instruments GmbH, Germany) for 5 RGP contact lenses according to the invention with surface coating. The samples were stored both openly in the ambient air and in an aqueous medium, in this case physiological saline (0.9% NaCl). The contact angles were determined at three different locations on the surface. The average measurement error of the contact angle microscope is ± 0.5 °. Acrylamide (AA) was used as the monomer. The last column shows the measurement results that were obtained after 14 days. In the case of samples that were stored openly in air, i.e. not in aqueous media, there was a reversible shift in the contact angle up to values of up to 40 °, but this was brought back to values below by contacting and brief storage in physiological saline 30 ° could be set. It can be seen that no dewetting processes occurred even after 14 days.

The contact angles are below 30 ° and keep this value for at least 14 days even when in contact with aqueous media. This corresponds to a sufficiently hydrophilic surface under normal conditions of use.

It can also be seen that the hydrophilicity of the surface in the contact lenses according to the invention with surface coating is independent of the direction.

Table 1: Contact angle measurements on contact lenses according to the invention with

Surface coating

The contact lenses according to the invention with surface coating likewise show a reduction in the growth of bacteria and cells.

For clarification, the light microscope image (device: Olympus, Provis) of a Thermanox surface can be seen in Figure 5, to which a bacterial suspension of Lactobacillus Reuteri Prodentis was added. For this purpose, the bacteria were first cultivated for 3 days on blood agar at 38 ° C. with 5% CO ₂ . Then 3 colonies from the blood agar plate were suspended in 5 ml CASO (commercially available nutrient medium for bacteria). The samples were then incubated in a 5000-fold dilution of the suspension for 24 hours at 38 ° C. and 5% CO ₂ . The pearl-string-like morphology of the bacteria can be clearly seen. Figure 6 shows the surface of an RGP contact lens not according to the invention after the plasma treatment (step I). The number of bacterial colonies is compared to

Thermanox surface less, but bacteria colonies can be seen. Figure 7 shows the surface of a contact lens according to the invention with a surface coating. Cultures of Lactobacillus Reuteri Prodentis have not grown, which is a considerable advantage.

To demonstrate the reduction in the growth of cell cultures on the

According to the invention, contact lenses with surface coating, the following experiment was carried out with adherent fibroblasts as cell cultures. Primary human fibroblasts, obtained from tissue remnants of extracted wisdom teeth, were supplemented with 10% calf serum in Minimum Essential Medium (alpha modification, Sigma; alpha-MEM)

(Biochrome) grown in sufficient numbers (38 ° C, 95% humidity and 5% C0 ₂ ). For the adhesion test, the samples to be tested were placed in 6-well tissue culture plates and covered with 2 ml cell suspension of 2x10 ⁵ cells each. After a 24 hour incubation under the above conditions, the samples were rinsed in fresh alpha-MEM 5x to remove non-adherent cells. The samples treated in this way were then examined for cell growth using an inverse phase contrast microscope (Biostar, Reichert-Jung).

Figure 8 shows the surface of the Thermanox sample. The grown fibroblasts can be clearly seen. Figure 9 shows the surface of an RGP contact lens after the plasma treatment (step I), the fibroblasts can also be clearly seen.

Figure 10 shows the surface of a contact lens according to the invention

Surface coating. There are no fibroblasts with their typical morphology. It can thus be shown that the adhesion of bacteria and cells on the contact lenses is reduced by the coating according to the invention.

Proof of the toxicological safety of the samples:

The toxicological safety of the contact lenses according to the invention

Surface coating has been verified in accordance with DIN-EN-ISO 10993-5.

The cytotoxic potential of the coatings examined was investigated using XTT in the sense of DIN-EN-ISO 10993-5 with primary human gingiva fibroblasts and with a commercial cell line (HACAT, human keratinocytes). The coatings according to the invention showed no cytotoxicity, the survival rates were 95% +/- 2% in relation to

Negative control (Thermanox).

Details on the exemplary production of the contact lens with surface coating:

Objective: Production of contact lens surfaces with controllable wetting for

Improve comfort and minimize inflammation risks.

Principle: Hydrophilic monomers (acrylates, methacrylates, acrylamides) are photopolymerized on the surface using a suitable initiator and light source. The initiator can

Monomer portion are added and then applied as a mix or it can be anchored to the surface in a first step using crosslinkers. In the second case, photopolymerization with monoacrylates leads to the formation of surface brushes.

Monomers:

- methacrylates

- acrylates

- acrylamides

- As well as mixtures of the individual types of monomers

Initiators:

Depending on the light source, a suitable initiator should be used. In this work, type 2 initiators were used (benzophenone type: benzophenone, 4-aminobenzophenone and PPD). Isopropanol was used as the coinitiator.

Light source:

The light source should correspond to the absorption maximum of the initiator. In the The present work was carried out with a UV LED lamp (Opsytec, series SFL; 500mW / cm ² at a distance of 10 mm from the emission window) with an emission wavelength of 365 nm.

Surface preparation:

The surfaces are activated by an oxygen plasma treatment (0.2mbar, 300W, 5scc, 2 minutes).

A methacrylic silane layer serves as a primer, which is applied over the vapor phase (45 °, 1h, + 5min RT for cooling). The sample then cures for 1 h at 45 ° C in a vacuum (- 1bar).

Polymerization of acrylamide:

The monomer is in the form of a 25% (w / v) solution. 7.5 ml of a 1% PPD solution in isopropanol are mixed with 250 ml of the monomer solution and then applied to the sample. To minimize the disturbing oxygen effect, the sample is covered with a cover glass and then exposed 1-5 times for 70 seconds each. The contact lens according to the invention with a surface coating is shown after the exposure step has been carried out three to five times.

Exposure pauses of 2 minutes each prevent the contact lenses from overheating too much. After the polymerization, the cover slip is removed and the sample is rinsed thoroughly with water (Vortex 3x).

Polymerization of di - and polyethylene glycol methyl ether methacrylate:

The methacrylate is mixed with water in a ratio of 1: 3. 7.5 ml PPD are mixed with 3 ml of the diluted acrylate and put to the test. Again, the surface is protected from oxygen with a cover slip. The subsequent exposure lasts between 40 to 90 seconds and is followed by a thorough cleaning process with water.

Crosslink the initiator to the substrate surface:

In this case, the plasma-activated surface is treated with a mixture of methacrylsilane and APTMS in the vapor phase. The silane layer is cured as described above. 4-Benzoylbenzoic acid is used as the initiator. The initiator is in MES buffer (5mM;

pH5.6) dissolved, activated with EDC / NHS (2mg / ml each). The samples are then treated in this solution for about 15 minutes at room temperature and then with distilled Rinsed water and dried. After this step, the initiator is coupled to the surface. Immediately afterwards the photopolymerization takes place as described above.

Abbreviations:

PPD: 1-phenyl-1,2-propanedione

MES: 2-Morpholinoethanesulfonic acid / Na salt

EDC: 1-ethyl-3- (3'-dimethylaminopropyl) carbodiimide HCl

NHS: 1-hydroxy-2,5-pyrrolidinedione

Fig. 1: AFM image of a contact lens according to the invention with surface coating,

RGP lens, monomer: acrylamide, exposed 5 times.

Fig. 2: AFM image of a contact lens according to the invention with surface coating,

RGP lens, monomer: acrylamide, exposed 5 times, at higher magnifications

Fig. 3: AFM image of the RGP contact lens after the oxygen plasma treatment (step

I) and before the coating according to the invention.

Fig. 4: AFM image of the RGP contact lens after a single exposure (step VII),

Monomer: acrylamide.

Fig. 5: Thermanox control surface with the cultures: Lactobacillus Reuteri Prodentis

Fig. 6: Surface of an RGP contact lens after the plasma treatment (step I) (not

according to the invention) also with the cultures: Lactobacillus Reuteri Prodentis.

Fig. 7: Surface of a contact lens according to the invention (RGP contact lens) with

Surface coating also with the cultures: Lactobacillus Reuteri Prodentis added, these could not grow.

Fig. 8: Thermanox control surface with adherent fibroblasts

Fig. 9: Surface of an RGP contact lens after the plasma treatment (step I) (not

according to the invention) also with adherent fibroblasts

Fig. 10: Surface of a contact lens according to the invention (RGP contact lens) with

Surface coating also treated with fibroblasts, which could not grow

Claims

EXPECTATIONS

1. contact lens with a surface coating,

characterized in that

the surface has a contact angle with respect to water or aqueous solutions as a liquid of less than or equal to 30 ° and the contact angle with respect to an area of more than 50 x 50 pm ^{2 is} independent of direction.

2. contact lens with a surface coating according to claim 1,

characterized in that

the surface coating on the surface is periodic, wave-like

Topography with one wavelength (W)

- between 70 and 200 nm

or

- between 80 and 180 nm

or

- between 80 and 160 nm

and an amplitude (A)

- between 5 and 20 nm

or

- between 6 and 18 nm

or

- between 7 and 16 nm

having,

wherein the domain sizes of the areas of the same orientation have a size of 5 x 5 pm ² up to 50 x 50 pm ² .

3. contact lens with a surface coating according to claim 1 or 2,

characterized in that

the contact angle of less than or equal to 30 ° is maintained when in contact with aqueous media over a period of 14 days.

4. Contact lens with a surface coating according to one of claims 1, 2 or 3, characterized in that

the contact lens has a reduction in the growth of bacteria on the surface due to the surface coating.

5. contact lens with a surface coating according to any one of the preceding claims,

characterized in that

the surface coating is a covalently attached layer.

6. contact lens with a surface coating according to any one of the preceding claims,

characterized in that

the surface coating is a layer containing poly- and oligomers of acrylamides and / or acrylates and / or methacrylates.

7. contact lens with a surface coating according to one of the preceding claims,

characterized in that

the surface coating is a layer containing poly- and oligomers of zwitterionic acrylamides and / or acrylates and / or methacrylates.

8. contact lens with a surface coating according to any one of the preceding claims,

characterized in that

the contact lens is an RGP contact lens.

9. A method for producing a contact lens with a surface coating according to one of the preceding claims comprising the steps:

I. Pretreatment of an uncoated contact lens using an oxygen plasma treatment;

II. Silanizing the pretreated surface;

III. Drying the contact lens treated with the silane primer;

IV. Applying the photopolymerization initiator for later polymerization;

V. applying the dissolved monomer;

VI. Covering the solution;

VII. Expose the solution for 40 to 90 seconds;

VIII. Turn off the light source and let the solution rest for 2 minutes;

IX. Repeating the exposure step VII and step VIII and 2 to 4 times

X. Rinsing the surface coated contact lens.