referring now to the present invention in more detail , in fig1 there is shown an adjustable winged eyecup ( 10 ). the winged eyecup ( 10 ) is made up of three basic areas ; first the wing ( 12 ) second the band ( 14 ) and third the fastener ( 16 ). the wing &# 39 ; s ( 12 ) primary purpose is to create a seal to the users eye and block light , and elements such as wind , rain , and snow entering into the eye . the wing must be sufficiently large enough to surround user &# 39 ; s eye . the band ( 14 ) attaches the wing ( 12 ) to an optical device and allows the user to apply the eyecup ( 10 ) to a wide range of optical devices . the band ( 14 ) in conjunction with the fastener ( 16 ) securely holds the eyecup in place and allows the user to adjust the length of eye relief needed for the optical device . the width of the band ( 14 ) allows for greater eye relief adjustment and provides protection for the eyepiece . the fastener ( 16 ) is designed to be easily attached and removed but when attached it firmly secures the eyecup to the optical device . in more detail , the winged eyecup ( 10 ), when in use , will be positioned on the binocular ( 20 ) ( fig5 ) to encircle the eyepiece of the binocular and when raised to the users face the winged eyecup ( 10 ) will encircle the user &# 39 ; s eyes . the winged eyecup ( 10 ) will be adjusted by the user to block light from entering into the eye except through the objective lens of the optical device . the eyecup ( 10 ) may also be re - positioned on the optical eye piece ( 18 ) to account for eye relief . this allows the eye to be held at a constant distance away from the eye allowing for full field of view of the optical device . optical devices have varying eye relief values . the winged eyecup ( 10 ) can be made of various different materials . the material shown for both the wing ( 12 ) and band ( 14 ) is neoprene , but these could be made out of any semi - rigid material . the fastener ( 16 ) can also be of different connecting technologies . the fastening device shown is velcro . in fig2 a top view is shown of a winged eyecup ( 10 ) and gives a representation of the thickness of material used . the material used must be flexible enough as to be positioned around the eye piece , but rigid enough to hold its shape against the user &# 39 ; s eye . it must also be comfortable for the user when positioned against the user &# 39 ; s face . it also shows the fastener used ( 16 ). in fig3 and 4 you see both a side view fig3 and top view fig4 of a winged eyecup ( 10 ) with the fastener ( 16 ) in place . it shows how the device would be fitted around a circular eye piece ( 18 ). it shows how the fastening device ( 16 ) holds the band ( 14 ) together . in fig5 a perspective view of the winged eyecup ( 10 ) is shown attached to a binocular ( 20 ). the material is wrapped around the eyepiece ( 18 ) of the optical device ( 20 ) and is held in place by a fastener ( 16 ). this method allows for eyepieces of different diameters , shapes , and sizes to be fitted from a single winged eyecup ( 10 ). for each eyepiece ( 18 ) a winged eyecup ( 10 ) is present . for example a binocular ( 10 ) has two eyepieces ( 18 ) so two winged eyecups ( 10 ) would be applied . on a monocular a single eyecup ( 10 ) would be present . the advantages of the present invention include an adjustable winged eyecup that the consumer can easily apply to a wide range of optics . the present invention does not require the manufacture to supply the eyecup and there for can be fitted to existing optics or new optics . there are winged eyecups available for a very few binoculars but these are not interchangeable and are not designed to be applied by the user . the present invention gives the user the ability to apply and remove the winged eyecup to wide range of optics . the present invention also protects the eyepiece of the optical device and provides an eye relief adjustment that the existing eyecups do not provide . while the foregoing written description of the invention enables one of ordinary skill to make and use what is considered presently to be the best mode thereof , those of ordinary skill will understand and appreciate the existence of variations , combinations , and equivalents of the specific embodiment , method , and examples herein . the invention should therefore not be limited by the above described embodiment , method , and examples , but by all embodiments and methods within the scope and spirit of the invention as claimed .