Visor

Abstract

A curved visor comprising a front portion that, in use, is positioned in front of a user's face, a peripheral portion that, in use, is positioned to the sides of the user's face, and an inner surface; wherein the front and peripheral portions are each made of an optically transparent or translucent material, and the front and peripheral portions together form a curved visor body that, in use, provides a user with a substantially uninterrupted field of view; and wherein the curved visor further comprises a first reflective portion positioned along the curved visor body between the front and peripheral portions, the first reflective portion being positioned and angled relative to the curved visor body such that, in use, the user is provided with an image of an environment behind the user.

Description

FIELD The invention relates to a visor that provides the user with both forward vision and rearward vision. BACKGROUND Typically, eyewear (e.g., spectacles, goggles etc.) comprise transparent or translucent lenses through which the user can observe the environment in front of them. In some situations, it is also useful for the user to see the environment behind them (e.g., when cycling, rowing, running, horse riding, or for security purposes etc). Eyewear that provides both forward and rearward vision is particularly useful for cyclists. In many situations it can be important to be aware of your surroundings, particularly in busy environments. For example, when cycling, particularly in traffic, it is important for the cyclist to be aware of their surroundings. This includes being able to see all around them, including behind them so that they can see cars or traffic approaching from the rear, or to see that their fellow cyclists are following them. In competitive sports, there is often a desire to have rearward vision to be able to identify approaching competitors. Typically, cyclists, rowers, runners and ice skaters, for example, will turn their head and bodies in order to see behind them. However, this can result in off-balancing and can be dangerous for the competitor and others around them, particularly when they are travelling at high speeds. In competitive sports, it is also desirable to have a single continuous lens (i.e., a visor) which covers at least both eyes and is curved. Such a lens is designed to be aerodynamic, to not introduce undesirable drag forces, and to beneficially help keep debris, wind and rain etc off the wearer's face. Currently, it is known in the art to provide rearward vision by modifying eyewear to include a mirror or a reflective portion. There prior art devices can generally be split into three categories: 1) glasses having one or more mirrors attached externally to, and protruding from, the outer frame of the glasses. These mirrors are completely separate from the transparent or translucent lenses of the eyewear. The problem with these external mirrors is that they add to the size of the eyewear, are at risk of breaking off the frame, and may be accidently knocked or moved out of an optimal position. They are also not particularly suited to the needs and requirements of cyclists or active sportsmen. This is because the externally protruding mirrors make the wearer less aerodynamic, and windy conditions / high speeds may inadvertently change the angle at which the mirrors are positioned. Furthermore, collisions or falls may result in breakage of the appended mirrors, which would render the eyewear ineffective and could pose a hazard to the wearer. 2) eyewear having a reflective coating applied to a peripheral portion of a typical see through (transparent or translucent), forward-viewing lens, wherein the reflective coating provides rearward vision for the wearer if they look in the direction of the reflective coating. These prior art devices are typically sold as novelty items and have not been found to provide rearward vision which is sufficiently clear or with a useful field of vision for the wearer, especially for use during serious activities, such as cycling. Both of these types of eyewear are know to lead to eye strain due to the viewing angle caused by the positioning of the mirrors relative to the wearer’s eyes. 3) The third category of devices is a lens having a discontinuity, which defines a first portion on an inner side of the discontinuity (nearest the nose in use) and a second portion on an outer side of the discontinuity (furthest from the nose in use). In such a design, the second portion has a reflective side which is at least partially reflective and is angled relative to the first portion, thereby allowing the user to see ahead by looking through the first, forward-viewing (transparent or translucent) portion, and allowing the user to see rearward by looking through the second portion, which is angled and at least partially reflective. Such a design eliminates the need for separate mirrors and lenses. The angling of the second portion relative to the first portion provides an optimal rearward view. Although the third category of lens is known to work well, it would not be possible to simply introduce a discontinuity as used in those lenses into a visor, because angling the outer side of the visor to create a second portion would mean that the visor would no longer fit the wearer. Visors are designed to be aerodynamic and often follow the contours of a wearer's face, wrapping around the sides of the face. Because of this, the angle of the discontinuity would not be possible to achieve on a curved visor. For example, the angle needed to achieve a rear view would mean the visor would need to be angled away from the face, effectively creating wings protruding outwards. Furthermore, the curvature would distort the rear view if attempted. Any such discontinuity would also negatively affect the aerodynamics of the visor. Furthermore, it is not possible to simply apply a reflective coating to the visor, because the curvature of the visor would result in a distorted reflection. The present disclosure seeks to alleviate, at least to a certain degree, the problems and / or address at least to a certain extent, the difficulties associated with the prior art. SUMMARY OF INVENTION According to a first aspect of the disclosure, there is provided a curved visor comprising: -   a front portion that, in use, is positioned in front of a user's face, -   a peripheral portion that, in use, is positioned to the sides of the user's face, - an inner surface; wherein the front and peripheral portions are each made of an optically transparent or translucent material, and the portions together form a curved visor body that, in use, provides a user with a substantially uninterrupted field of view; and wherein the curved visor further comprises a first reflective portion positioned along the curved visor body between the front and peripheral portions, the first reflective portion being positioned and angled relative to the curved visor such that, in use, the user is provided with an image of an environment behind the user. In a second aspect there is provided a curved visor comprising a transparent or translucent visor body that extends around a curve, the curve being substantially symmetrical about a central plane that vertically bisects the visor body, the visor body comprising: - a first inset portion set into the visor body, the first inset portion being positioned on one side of the central plane separated from the central plane by a distance D; and - the first inset portion comprising a first reflective portion, the first reflective portion being positioned and angled with respect to the central plane. In a third aspect there is provided a curved visor comprising a transparent or translucent visor body that extends around a curve, the curve being substantially symmetrical about a central plane that vertically bisects the visor body, the visor body comprising: - a first reflective portion positioned on an inner surface of the visor body, the first reflective portion being positioned on one side of the central plane separated from the central plane by a respective distance D; and - the first reflective portions being positioned and angled with respect to the central plane. In a fourth aspect there is provided racing glasses for a helmet comprising the curved visor as disclosed herein. Features from one or more aspects or any optional feature thereof may be combined together. BRIEF DESCRIPTION OF THE DRAWINGS The present disclosure may be carried out in various ways and examples of the disclosure will now be described by way of example with reference to the accompanying drawings, in which: Figure 1               shows a schematic example of a front perspective view of a curved visor according to the present invention. Figure 2              shows a schematic example of a top view of a curved visor according to the present invention. Figure 3              shows a schematic example of a rear view of a curved visor according to the present invention Figure 4              shows a schematic top view of an alternative embodiment using two different types of wedge to position and angle the reflective portion on the inner surface of the visor DETAILED DESCRIPTION Directional descriptors, for example, top, bottom, inner, outer, forward and rearward, etc., have been used throughout the following description to refer to the exemplary embodiments of the present invention as oriented in the preferred way during use, and as illustrated in the drawings. However, it will be apparent to those skilled in the art that the embodiments described hereinafter may be oriented in different ways than those illustrated and described. As such the directional descriptors are not intended to be limiting but are used for the purpose of the description only. Figure 1 illustrates a visor body 10. The visor body comprises a front portion 1 and a peripheral portion 2. The front portion 1 and the peripheral portion 2 are transparent or translucent. This allows the transmission of photons through the whole thickness of the front portion 1 and peripheral portion 2 of the visor 10 so that, in use, the wearer is able to see through the front portion 1 and peripheral portion 2 to view the environment in front of them and to the side. The front portion 1 and the peripheral portion 2 will henceforth be collectively referred to as the forward-viewing portion for ease of reference. The forwarding-viewing portion may be completely clear, or may include a tint or filter(s). The forward-viewing portion may also provide or facilitate the housing of vision correction for users who require prescription lenses to see clearly. The front portion 1 and the peripheral portion 2 together form a curved visor body and may be integrally formed. Where integrally formed, there may be no discernible demarcation between the front portion and the peripheral portion. The visor is formed of a flat piece (or pieces) of material that are curved into shape to form a curved visor. As such, the visor can be said to have two faces. As employed herein, curve, curved and arc refer to the shape of the visor. That is, the shape is typically symmetrical about an apex, with two end points. The curvature may or may not be constant across the entire curve. The curvature may be part of a circle, an oval or an ellipse. The curve may be a cylindrical curve or a spherical curve. That is to say, the curve may occur in one direction, or in two directions. Thus the curve may extend left to right, around the width of the wearer’s face (e.g. ear to ear). Or the curve ma extend left to right (ear to ear) and top to bottom around a portion of the height of the wearer’s face (e.g. forehead to mouth). As employed herein, the front portion is the part substantially in front of the wearer’s eyes and across the front of the wearer’s face, in use. As employed herein the peripheral portion is the part, or parts collectively, to the sides of the wearer’s head in use. This region is intended to cover the region that the wearer would deem to be the area of peripheral vision plus anything beyond that, traveling along the curve of the visor towards the ears (i.e. the ends) and away from the centre (apex) of the curve. The inner surface as employed herein refers to the face of the visor that a proximal to the wearer’s face in use. Conversely, the other face of the visor could be referred to as an outer surface. Optically transparent as employed herein refers to the physical property of allowing light to pass through the material without appreciable scattering of light. Translucency refers to a material in which some light is scattered or absorbed. Reflective portion as employed herein refers to the part or parts of the visor that have reflective properties. Reflection occurs when light is bounced off a surface, ratherthan passing through it (or being absorbed). In some embodiments the reflective portion is partially reflective, that is, it is not fully reflective. Partially reflective refers to the property of allowing a portion of incident photons to be reflected and a portion are permitted to transmit through the reflective portion. Fewer than 100% of photons are reflected. The reflective portion may be reflective by way of a reflective coating applied to the reflective portion. The reflective coating may cover the whole of the reflective portion or only a part of the reflective portion. The reflective coating may be applied to the inner surface or the outer surface of the reflective portion. In general, the reflective portion is flat or planar, although it may be useful to provide curved reflective portions that are capable of magnifying the rearview. The reflective portion or portions are positioned outside of the normal field of view of the wearer when looking forward. This is to avoid the front view being impeded. The reflection portion(s) are positioned at the interface of the front portion and the peripheral portion. The reflection portion(s) may completely separate the front portion from the peripheral portion or, alternatively, may only interrupt the interface of the front and peripheral portions in part. The reflective portion(s) may sit within inset portions as described herein, or may be formed from, or mounted on the inner surface of the visor as described herein. The visor body extends from a first end 13 to a second end 14. The first end and second end are located approximately near to a user's ears in use. A rear plane 6 extends between the first end 13 and the second end 14. It will be appreciated that the first and second ends may not end in the same location without deviating from the scope of the invention. The visor body extends substantially across and around the user's face in use i.e., at least across the front of both eyes, and also covers the peripheral vision region of the wearer in use. The visor may be a single piece and may extend around the wearer's face to approximately the location of the wearer's ears. It will be appreciated that the end point of the visor does not need to be the ears, it may vary without deviating from the essence of the invention. The visor 10 has a top-most edge 11 and a bottommost edge 12. In use, the top-most edge 11 would sit above the user's eyes, approximately in the forehead region (or above) and the bottom-most edge would sit below the user's eyes, approximately in the cheekbone region (or below). The visor body has a front, forward most point referred to as a centrepoint. The centrepoint is visible on Figure 2, and represents the point which would, if the visor were positioned on a wearer's face, be the forwardmost and frontmost point. Typically, this point is approximately directly in front of the wearer’s nose. In general, the centrepoint is equidistant from the first and second ends. There is a front plane 7 which is vertical and extends through the centrepoint, and which is parallel to the rear plane 6 and perpendicular to the central plane 8. There is a central plane 8 which is vertical and bisects the visor through the centrepoint, when the visor is in use. The visor itself, in general, is substantially symmetrical about the central plane 8. The central plane is perpendicular to the rear plane 6 and intersects the rear plane at a rear central point 15. The distance between the central plane and the first reflective portion is referred to a distance D. The distance between the central plane and the second reflective portion is referred to a distance D’. In some embodiment D and D’ are the same. In some embodiments, they may differ to suit the wearer’s preference. D and D’ are based, to some degree, on the distance between pupils. On average, an adult’s pupils will be 54mm to 74mm apart. In reference to the central plane of the visor, assuming the central plane is exactly halfway between the eyes, this means that the pupils will be approximately 27mm to 37mm from the central plane. In the present invention, D and D’ may be offset in the range 10mm to 100mm from each pupil Thus, D and D’ as employed herein are each independently in the range approximately 37mm to 137mm. For example, approximately 35, 40, 45, 50, 55, 60, 70, 80, 90, 100, 110, 120, 130 or 140mm.. In one embodiment, embedded within the visor 10 are first and second inset portions 4,5. The inset portions may each comprise a reflective portion 17,18 which may be formed by a reflective coating applied thereon. The inset portions 4,5 are positioned between the front portion 1 and the peripheral portion 2 of the visor 10. The reflective coating need not be fully reflective. Indeed, it may be only partially reflective such that a portion of incident photons are reflected, and a portion are permitted to transmit though the reflective portions and inset portions 4,5 of the visor 10. Similarly, photons from the front of the visor will transmit through the reflective portion, permitting the wearer to see “through” the reflective portion. Alternatively, the reflective portions 17,18 may be completely reflective so that substantially all photons are reflected. The reflective portions 17,18 may also comprise a tint or filter e.g., as a coating. This is particularly useful for reducing glare or to bring the brightness of the rearward view to the same level as the brightness of the forward view. Alternatively, the visor 10 may only comprise a single inset portion and a single reflective portion on one side of the visor. There is an inset plane 9 running between the first and second inset portions 4,5, aligned to the front of the inset portions. The inset plane 9 is parallel to the rear and front planes 6,7 and intersects the central plane 8 at an inset central point 16. Where only one inset portion is used, the inset plane 9 is parallel to the rear and front planes and aligned with the front of the inset portion. The front and peripheral portions 1,2 may be a single piece suitable for covering both of a wearer's eyes, wrapping around the peripheral vision region (i.e. the side of the head). The inset portions 4,5 are positioned toward a peripheral region of the visor 10 and define where the front and peripheral portions meet i.e., the inset portions 4,5 are not in the centre of the visor and would not obstruct a wearer's view in use. Thus, when the wearer is looking straight ahead, the wearer will generally be looking through the front portion 1 of the visor 10. When the wearer wants to view the environment behind them, the wearer may direct their eyes to the reflective coating on the reflective portions 4,5 of the visor 10. If the user wants to see to the side, the wearer may direct their eyes to the peripheral portion 2 of the visor 10. It will be understood by those skilled in the art that the reflective portions provide specular reflection, rather than diffuse reflection, so as to provide the wearer with a clear image of the rear environment. The position of the inset portions 4,5 and their integration within the front and peripheral portions 1,2 is done so as to minimise visual disturbances occurring over the rest of the visor, particularly where the front portion meets the inset portions, and where the peripheral portion meets the inset portions i.e., the parts of the visor at which the curvature is disrupted by integrating the inset portions 4,5. The reflective coating may be provided on the inner surface of the reflective portion (i.e., the surface adjacent the wearer's face, during use), or on the outer surface of the reflective portion. If the reflective coating is provided on the outer surface of the reflective portions, photons will travel through reflective portions via the rearmost surface of the reflective portion (or the inset portion where the reflective portion is made by applying a reflective coating directly to the inset portion) before they are reflected back toward the wearer's eyes. As such, the inset portions 4,5 may be manufactured so as to utilise and manipulate the refractive properties of the reflective portion material. This could help to optimise the path of photons to provide a clear image to the wearer. For example, the reflective portion may be manufactured to provide magnification (negative or positive) of focal length adjustment of the image shown in the reflective coating, as seen by the wearer. Furthermore, the reflective portion material may comprise a filter 4,5, such as a polarising filter, which reduces glare from bright lights (e.g., car headlights). In the illustrated example of Figure 1, of the drawings, the inner surface area of the inset portions 4,5 is approximately 1 to 25% of the inner surface area of the overall visor. However, it will be apparent to those skilled in the art that other proportions would be suitable and the invention is not intended to be limited in this regard. In particular, the inner surface area of the reflective portion may be as small as 1% of the surface area of the overall visor, and up to about 25% of the inner surface area of the overall visor. The inset portions 4,5, as shown in Figure 1, are substantially rectangular in shape, although all suitable shapes are envisioned. The inset portions are also shown as flat and planar. In alternative embodiments, the inset portions 4,5 may be curved or irregularly shaped. Additionally, the size of the inset portions 4,5 may be varied. For example, the inset portions 4,5 may run vertically along the vertical height of the visor from the top edge 11 to the bottom edge 12. Alternatively, the inset portions 4,5 may be only a fraction of the vertical height of the visor 10 such that at least a part of the front portion contacts at least a part of the peripheral portion. The inset portions 4,5 may be positioned substantially centrally (as shown in Figure 1), that is in the middle of the vertical line of the visor body, or could be positioned closer to the bottom edge 12 of the visor 10 or closer to the top edge 11 of the visor 10. During use, the inset portions 4,5 may be angled toward the wearer's face such that the reflective portion and the reflective coating is facing the wearer. Alternatively, the inset portions 4,5 may be planar with the inset plane. Where the inset portions are planar, the reflective portion will be angled toward the wearer’s face. By angling the reflective portion toward the wearer incoming photons from behind the wearer reflect back into their eyes so that the wearer can see an image of the rear environment in the reflective portions. The inset portions 4,5 (or the reflective portions as described above) are angled relative to the substantially vertical inset plane which runs through the front of the inset portion and is parallel to the front plane which runs through the centrepoint of the visor (i.e. the apex of the curved visor), and is configured such that the wearer can see rearward. The inset portions 4,5 and the front and peripheral portions 1,2 may be formed integrally as a single visor from one piece of material. Alternatively, the inset portions 4,5 and the front and peripheral portions 1,2 may be formed separately and joined or fused together at the desired angle. In this way, the inset portions 4,5 may be embedded into existing visors. The visor may be made from any suitable material known to those skilled in the art e.g., glass, polycarbonate, Grilamide (TR-90), bio-acetate, plastics, or Perspex. Other suitable alternative materials known in the art may be used. The inset portions and / or reflective portions may be made of the same material and the visor or each independently made of different materials. It will be understood by the person skilled in the art that suitable means for holding the visor against a wearer's face during use may vary. For example, the visor could be integrated into a helmet, or the visor could be attached to a frame, and the frame could have arms or an elasticated (or otherwise adjustable) band to wrap around the back of the wearer's head during use. The angle between the reflective portion relative to the inset plane (or the front plane) may be at least 100°, at least 105°, at least 110°, at least 115°, at least 120°, at least 125°, at least 130°, at least 135°, at least 140°, at least 145°, at least 150°, at least 155°, at least 160°, at least 165°, at least 170°, or at least 175°. The angle between the reflective portion relative to the inset plane (orthe front plane) may be upto or even over 180°. In some embodiments, the angle is in the range 170° and 180°, such as 171, 172, 173, 174, 175, 176, 177, 178 or 179°. In another embodiment, the angle is about 177°, such as 176.7, 176.8, 176.9, 177.0, 177.1, 177.2, 177.3, 177.4, 177.5 or 177.6°. In another embodiment, the angle is approximately 177.2°. In an alternative embodiment, the reflective portion or portions 17,18 could be positioned on the inside of the visor, that is, mounted or formed from the inner surface of the visor. Instead of being embedded within the visor in the inset portions 4,5 and being positioned between the front and peripheral portions of the visor, the reflective portions 17,18 may be positioned on an inner surface ofthe visor i.e., the side closest to a wearer's face in use. In other words, the reflective portions 17,18 are not embedded within inset portions 4,5, but are applied directly to, or formed directly from the inner surface of the visor to allow rearward view. In this way, the reflective portions 17,18 can be retrospectively added to existing visors. In this alternative embodiment, the reflective portions 17,18 are positioned using material designed to fixedly hold them at a desired angle, allowing the wearer to see rearward. Any suitable material may be used to hold the lenses in position. This could for example include an optically clear glue, a brace on the inside ofthe visor, a recess that is designed to hold the, to a high precision. Any material should not distort the user's forward vision i.e., excessive application of glue, for example, may create disturbances to a user's forward vision. Additionally, as the reflective portions 17,18 may also be partially reflective i.e., they may allow forward vision in addition to rear vision, any material used to position the reflective portions should not prevent forward vision. To achieve the desired angle for the reflective portion(s), this embodiment may employ any suitable means, for example a wedge may be positioned behind all or part ofthe reflective portion to build it out from the visor to the correct angle. Any wedge material would need to be selected so as to not distort the view through the reflective portion. The reflective portion itself could be manufactured to be wedge shaped. Two possible types of wedge are indicated in figure 4 at 20 and 21. The visor may comprise photochromic, anti-fog, anti-reflection, polarised, or prescription lenses as required by the user. In the context ofthe specification, "comprising" is to be interpreted as "including". Aspects of the invention comprising certain elements are also intended to extend to alternative embodiments "consisting" or "consisting essentially" of the relevant elements. Where technically appropriate, embodiments ofthe invention may be combined. Embodiments are described herein as comprising certain features / elements. The disclosure also extends to separate embodiments consisting or consisting essentially of said features / elements. Technical references such as patents and applications are incorporated herein by reference. Any embodiments specifically and explicitly recited herein may form the basis of a disclaimed either alone or in combination with one or more embodiments. 1 front portion 2 peripheral portion 3   - 4   inset portion 5   inset portion 6  Rear plane 7  Front plane 8 Central plane 9 Inset plane 10 visor 11 top-most edge 12 bottom-most edge 13 first end 14 second end 15 rear central point 16 inset central point 17 reflective portion 18 reflective portion 19 - 20 Wedge 21 wedge

Claims

1. A curved visor comprising:-   a front portion that, in use, is positioned in front of a user's face,-   a peripheral portion that, in use, is positioned to the sides of the user's face, and- an inner surface;wherein the front and peripheral portions are each made of an optically transparent or translucent material, and the front and peripheral portions together form a curved visor body that, in use, provides a user with a substantially uninterrupted field of view; andwherein the curved visor further comprises a first reflective portion positioned along the curved visor body between the front and peripheral portions, the first reflective portion being positioned and angled relative to the curved visor body such that, in use, the user is provided with an image of an environment behind the user.

2. The curved visor according to claim 1 wherein the visor body extends around an arc that is substantially symmetrical about a central plane that vertically bisects the visor body, and wherein the first reflective portion is positioned on one side of the central plane separated from the central plane by distance D.

3. The curved visor according to claim 2 further comprising a second reflective portion respectively positioned on an opposite side of the central plane relative to the first reflective portion, wherein the second reflective portion is separated from the central plane by distance D’.

4. The curved visor according to any preceding claim wherein the first and / or second reflective portions are inset into the curved visor body.

5. The curved visor according to any preceding claim wherein the first and / or second reflective portions are mounted to the inner surface.

6. The curved visor according to any preceding claim, wherein the front and peripheral portions are integrally formed.

7. The curved visor according to any preceding claim wherein the first and / or second reflective portions are integrally formed with the front and peripheral portions.

8. The curved visor according to any one of claims 1 to 6 wherein the first and / or second reflective portions are not integrally formed with the front and peripheral portions.

9. A curved visor comprising a transparent or translucent visor body that extends around a curve, the curve being substantially symmetrical about a central plane that vertically bisects the visor body, the visor body comprising:- a first inset portion set into the visor body, the first inset portion being positioned on one side of the central plane separated from the central plane by a distance D; and- the first inset portion comprising a first reflective portion, the first reflective portion being positioned and angled with respect to the central plane.

10. The curved visor according to claim 9 further comprising a second inset portion respectively positioned on an opposite side of the central plane relative to the first inset portion, wherein the second inset portion is separated from the central plane by distance D’.

11. The curved visor according to claim 10 wherein the second inset portion comprises a second reflective portion, the second reflective portion being positioned and angled with respect to the central plane.

12. A curved visor comprising a transparent or translucent visor body that extends around a curve, the curve being substantially symmetrical about a central plane that vertically bisects the visor body, the visor body comprising:- a first reflective portion positioned on an inner surface of the visor body, the first reflective portion being positioned on one side of the central plane separated from the central plane by a respective distance D; and- the first reflective portions being positioned and angled with respect to the central plane.

13. The curved visor according to claim 12 further comprising a second reflective portion respectively positioned on an opposite side of the central plane by distance D’, wherein the second reflective portion is positioned and angled with respect to the central plane.

14. The curved visor according to any preceding claim, wherein the first and / or second reflective portions are partially reflective.

15. The curved visor according to any preceding claim, wherein the first and / or second reflective portions are partially transparent or translucent.

16. The curved visor according to any of the preceding claims, wherein the first and / or second reflective portions each independently have an area which is in the range 10 to 200 mm217. The curved visor according to any of the preceding claims, wherein the surface area of the first and / or second reflective portions is each independently in the range 1 and 25% of the surface area of the visor.

18. The curved visor according to claims 2 to 17, wherein the first and / or second reflective portions are each angled relative to the central plane at an angle of approximately 170 to 180°.

19. The curved visor according to any one of claims 1 to 18 wherein D and D’ are each independently approximately 37mm to 137mm.

20. The curved visor according to any preceding claim, wherein the visor body comprises a filter for blocking particular wavelengths of light.

21. The curved visor according to any preceding claim, wherein the reflective portions comprise a reflective coating.

22. The curved visor according to claim 21, wherein the reflective coating is applied over part of the inner and / or outer surface of the reflective portion.

23. Racing glasses for a helmet comprising the curved visor of any of the preceding claims.

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