BACKGROUND OF THE INVENTION Field of the Invention

[0001] The present invention relates to the field of optic glasses and, in particular to, a contact lens to see underwater.

The Prior Arts

[0002] The structure of the human eye is not inherently suitable for providing humans with good vision underwater; the light refractive indexes of the cornea and the lens in the human eye structure are approximately 1.376 and 1.336 respectively, while the light refractive index of air is 1 ; please refer to Fig. 1. On land, visible light 100 travels in the air. passes through the cornea 200 and eye lens 300. is refracted, and focused to our retina 400, and is finally transmitted to the visual center of our brain. Therefore, we can clearly see objects on land.

[0003] Refraction of light generally occurs by way of light passing through different media according to the media's refractive index. Please refer to Fig.2. When the human eye is underwater, the light refractive index of water is approximately 1.331. However, the refractive index of the water, the eye cornea 200, and the eye lens 300 together are almost the same, so that the visible ray 100 is not going to refract enough in order to focus the image on the retina 400, but focus behind the retina 400. Therefore, when the human eye is in the water, the vision will be blurred and the image will be unclear.

[0004] Please refer to Fig. 3. In order to have vision in the water, today's divers and swimmers generally wear a pair of flat swimming goggles 500 to wrap around their eyes to overcome this problem; but wearing it for a long time makes people feel uncomfortable when tied to the forehead, and the glass inside the swimming goggles 500 becomes foggy and blurred due to the accumulation of water vapor, Wearing flat goggles adds to the swimmers' difficulty’: the goggles only provide very narrow and limited distance vision underwater.

SUMMARY OF THE INVENTION

[0005] In view of this, the main purpose of the present invention is to provide a contact lens to see underwater, which mainly includes: a lower layer of hydrogel glasses and an upper layer of hydrogel glasses; wherein

[0006] the upper layer of hydrogel glasses and the lower layer of hydrogel glasses overlap to form a sealed air gap for filling gas; the air gap covers a visual range of an eyeball.

[0007] In a preferred embodiment, the upper layer of hydrogel glasses and the lower layer of hydrogel glasses are integrally formed.

[0008] In a preferred embodiment, the upper layer of hydrogel glasses comprises a flat surface, and the flat surface covers the visual range of the eyeball. [0009] In a preferred embodiment, the upper layer of hydrogel glasses comprises a curved surface, and the curved surface covers the visual range of the eyeball.

[0010] In a preferred embodiment, when an eye is in an open state, the upper edge portion and lower edge portion of the lower layer of hydrogel glasses are respectively arranged inside an upper eyelid and a lower eyelid of the eye.

[0011] When used, the user wears contact lenses on both eyes to see underwater before diving. After diving into the water, in sequence the light passes through the water, the upper layer of hydrogel glasses, the sealed air gap, the lower layer of hydrogel glasses then is refracted into the eyeball. Before the light enters the eyeball in the water, the light passes through the air in the sealed air gap and then enters the eyeball, making the refractive index of light entering the eyeball the same as on land, so that the image is accurately reflected on the retina: the result provides swimmers and divers with a clear vision in the water.

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Fig.l Schematic diagram of light entering the eye on land when air is the medium.

[0013] Fig.2 Schematic diagram of light entering the eye in the water when water is used as the medium.

[0014] Fig.3 Schematic diagram of light entering the eyes in water through swimming goggles. [0015] Fig.4 is a side structural cross-sectional view of a contact lens to see underwater according to one embodiment of the present invention, in which the upper layer of hydrogel glasses comprises a plane.

[0016] Fig.5 is a schematic front view of the structure of a contact lens to see underwater according to one embodiment of the present invention, in w hich the upper layer of hydrogel glasses comprises a flat surface.

[0017] Fig.6 is a schematic diagram of a contact lens to see underwater according to one embodiment of the present invention, in which the upper layer of hydrogel glasses comprises a flat surface and is worn on the eyeball.

[0018] Fig.7 is a side structural cross-sectional view of a contact lens to see underwater according to one embodiment of the present invention, in which the upper layer of the hydrogel lens comprises a curved surface.

[0019] Fig.8 is a side structural cross-sectional view of a contact lens to see underw ater according to another embodiment of the present invention, in which the upper layer of the hydrogel lens comprises a curved surface.

[0020] Fig.9 is a schematic structural diagram of a contact lens to see underwater according to one embodiment of the present invention, in which the upper edge portion and the lower edge portion of the lower layer of hydrogel glasses are respectively disposed inside the upper eyelid and the lower eyelid to insure stability when being worn.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0021] In order to facilitate understanding of the content of the present invention and the effects that can be achieved, specific embodiments are enumerated in conjunction with the drawings, and the detailed description is as follows: Please refer to Figs. 4 to

9, a present invention contact lens 1 to see underwater, mainly comprising: a lower layer of hydrogel glasses 11 worn on the eyeball 2; wherein, the presented contact lens 1 further comprises an upper layer of hydrogel glasses 12; the upper layer of hydrogel glasses 12 covers the lower layer of hydrogel glasses 11. The upper layer of hydrogel glasses 12 and the lower layer of hydrogel glasses 11 overlap to form a sealed air gap 13 for filling gas (air); the air gap 13 covers a visual range of an eyeball 2.

[0022] During practical application, the presented contact lens 1 is worn on the eyes before diving, and the lower layer of hydrogel glasses 11 is adsorbed on the eyeball 2 through the eye tears 21 on the eyeball 2 like a suction cup; when diving into the water , the light in the water enters the eyeball 2 sequentially through the water, the upper layer of hydrogel glasses 12, the air gap 13, and the lower layer of hydrogel glasses 11 . Since the refractive index of water is higher than that of air, after the light enters the air gap 13, the air in the air gap 13 (or pure oxygen or other transparent gases know n not to cause water vapor condensation) is refracted and then enters the eyeball 2. The image is correctly focused on the retina, and the swimmer can clearly see the underwater world.

[0023] Preferably, as shown in Figs. 4 and 6, the lower layer of hydrogel glasses 11 and the upper layer of hydrogel glasses 12 are integrally formed. The integrally formed one-piece structure is stronger.

[0024] In a preferred embodiment, as shown in Figs. 4 to 6, the upper layer of hydrogel glasses 12 comprises a flat surface 121, and the flat surface 121 covers the visual range of the eyeball 2. The flat surface 121 provides the user with clear vision that is more equivalent to that on land.

[0025] In a preferred implementation, as shown in Figs. 7 to 8, the upper layer of hydrogel glasses 12 comprises a curved surface 122, and the curved surface 122 covers the visual range of the eyeball 2. The curved surface 122 provides the user w ith a more comfortable wearing experience, and the curvature of the curved surface 122 enables a wide visual range.

[0026] Preferably, as shown in Fig. 9, when the lower layer of hydrogel glasses 11 is in an open state, the upper edge portion 111 and the lower edge portion 1 12 of the low er layer of hydrogel glasses 11 are respectively disposed inside of the upper eyelid 22 and the lower eyelid 23 of the eyes. The design purpose of this structure is to provide a better stabilizing effect by clamping the lower layer of hydrogel glasses 11 on both the inside of the upper eyelid 22 and the lower eyelid 23 when the user is diving underwater.

[0027] Compared with the existing conventional technology, the underwater vision contact lens of the present invention provides a clear and much wider vision for the swimmers and divers to see clearly and freely under water like a fish for the first time in human history. [0028] To sum up, the invention is novel and practical and fully meets the patent requirements, and a new patent application is proposed. However, the foregoing are only preferred embodiments of the present invention and should not be used to limit the scope of the present invention. Therefore, all equivalent changes and modifications made based on the patent scope of the present invention and the content of the invention specification shall be within the scope covered by the patent of present invention.