In my search for new options in specialty contact lenses that could help post refractive surgery patients, I received some literature about this new one. It is called the Pinhole Contact Lens. I have heard about pinhole glasses but this is the first time I hear about pinhole contact lenses.
Breger Vision introduces PINHOLE CONTACT LENS
For the first time in contact lens history, a single vision lens is combined with a pinhole lens giving the pinhole effect resulting in an RGP bifocal that works with guaranteed success.
The pinhole effect keeps both bifocal powers in front of the pupil at all times for a simultaneous binocular bifocal that works without interruption from blinking or lens movement.
This is a new and revolutionary design that gives near distance and intermediate vision with binocularity and stereopsis. It is very easy to fit because 5 fitting procedures are eliminated: fitting the dominant eye, fitting the non dominant eye, fitting for translation, fitting for compromised powers and fitting for lid attachment
The pinhole aperture stop before the entrance pupil eliminates peripheral light rays and allows light rays to travel in straight lines through the pinhole lens. This creates the following effects to vision: aberrations attributed to peripheral light rays are eliminated; the blur circle is reduced in diameter, there is an increase in contrast sensitivity, the retinal image is improved the depth of field is greatly increased, intermediate vision is created.
The narrow aperture of the Pinhole lens does not restrict the field of vision because of its close proximity to the entrance pupil. There is no reduction in luminance. The Pinhole lens gives the patient utilization of full visual potential (as the vision demonstrated with a pinhole disc). There are no visual compromises, Pinhole gives maximum vision to each eye.
Pinhole eliminates ghosting, flare and blur where the cause is light scatter from junctions and mal-positioning of power zones. There is only one junction in Pinhole -- that between near and distance zones -- and that junction is invisible. Mal-positioning of power zones in the lens is absent by virtue of zone diameter sizes and minimal lens movement. Computer users require and get a greater depth of focus and patients having demands for extremely good acuity get it. The fitters job becomes lighter in absence of complex lens designs and improved fitting procedures
The pinhole lens was invented by Porta in the 16th Century to give depth of field to optical instruments. A pinhole lens in a camera has a depth of field where all objects in front of the camera are in focus. The principles of the pinhole lens have been extended into today's field of refractive procedures with the pinhole disc. A pinhole lens put into a contact lens works on the same principle of a pinhole camera. Pinhole lens in front of the entrance pupil acts as a camera aperture stop, narrowing a bundle of light rays, eliminating peripheral light rays and allowing straight line light rays to enter the eye, giving the pinhole effect -- everything in front of the pupil is in simultaneous focus.
The Pinhole contact lens is available in Paragon HDS 100 material and it is FDA approved for 7 days continued wear. It is also available in Boston XO material with a DK of 100 and UV blocker. For dry eyes it is available in the Innovision Hydro2 material, with a DK of 50 and a 5 degree wetting angle.
This lens is manufactured by Breger vision and has a patent pending