Question: Who is the co-founder of a British optical retail chain, operating globally, which offers "optician services", along with eyeglasses, contact lenses and hearing aids ?

Context paragraphs:
Specsavers: Specsavers Optical Group Ltd is a British optical retail chain, operating globally, which offers "optician services", along with eyeglasses, contact lenses and hearing aids.  In 2012 it had the largest single market share of the four major opticians, with 42% of the market within the United Kingdom.

Cohen's Fashion Optical: Cohen's Fashion Optical (formerly known as Cohen’s Optical) is an optical retailer featuring fashion products such as eyeglasses, frames and sunglasses, lenses, contact lenses, and accessories.  Professional eye exams are usually available with on-site Doctors of Optometry.

Bone-anchored hearing aid: A bone-anchored hearing aid (BAHA) or bone-anchored hearing device, is a type of hearing aid based on bone conduction.  It is primarily suited for people who have conductive hearing losses, unilateral hearing loss, single-sided deafness and people with mixed hearing losses who cannot otherwise wear 'in the ear' or 'behind the ear' hearing aids.  They are more expensive than conventional hearing aids, and their placement involves invasive surgery which carries a risk of complications, although when complications do occur, they are usually minor.

Mary Perkins: Dame Mary Lesley Perkins, DBE (born 14 February 1944) is co-founder of Specsavers, the British retail opticians chain.

Scientific equipment optician: A Scientific equipment optician is an individual who makes and adjusts other optical aids, including telescope optics and microscope lenses.  See also Optician for individuals who make and adjust eyeglasses.

History of hearing aids: The first hearing aid was created in the 17th century.  The movement toward modern hearing aids began with the creation of the telephone, and the first electric hearing aid was created in 1898.  By the late 20th century, the digital hearing aid was distributed to the public commercially.  Some of the first hearing aids were external hearing aids.  External hearing aids directed sounds in front of the ear and blocked all other noises.  The apparatus would fit behind or in the ear.

Invisible disability: Invisible disabilities are disabilities that are not immediately apparent.  For instance, some people with visual or auditory disabilities who do not wear glasses or hearing aids, or discreet hearing aids, may not be obviously disabled.  Some people who have vision loss may wear contact lenses.  A sitting disability is another category of invisible impairments; sitting problems are usually caused by chronic back pain.  Those with joint problems or chronic pain may not use mobility aids on some days, or at all.  Most people with RSI move in a 'normal' and inconspicuous way, and are even encouraged by the medical community to be as active as possible, including playing sports; yet those people can have dramatic limitations in how much they can type, write or how long they can hold a phone or other objects in their hands.

FramesDirect.com: FramesDirect.com is an international online eyewear retailer.  The company sells eyewear products such as eyeglasses, sunglasses, and contact lenses through its website.  FramesDirect.com sells designer and brand name eyewear products with over 110,000 models displayed on its website.  Founded in 1996, FramesDirect.com was one of the earliest online optical retail stores.

Contact lens: A contact lens, or simply contact, is a thin lens placed directly on the surface of the eye.  Contact lenses are considered medical devices and can be worn to correct vision, or for cosmetic or therapeutic reasons.  In 2004, it was estimated that 125 million people worldwide use contact lenses, including 28 to 38 million in the United States.  In 2010, the worldwide market for contact lenses was estimated at $6.1 billion, while the US soft lens market was estimated at $2.1 billion.  Multiple analysts estimated that the global market for contact lenses would reach $11.7 billion by 2015.  s of 2010 , the average age of contact lens wearers globally was 31 years old, and two-thirds of wearers were female.

Miracle-Ear: Miracle-Ear, Inc. is a hearing aid company consisting of a network of franchised and corporately-owned retail outlets.  The company is a subsidiary of , the worldwide distributor of hearing aids based in Italy.  Miracle-Ear’s U.S. headquarters are located in Minneapolis, Minnesota.  As of 2014 it has more than 1,200 locations in the United States, and it is the best-known hearing aid brand in the U.S.  In 2014, the company added several locations in Canada, with plans to open more Canadian outlets.  According to the company, Miracle-Ear outlets offer free hearing tests and consultations, and the hearing aids include a risk-free 30-day trial period plus service, warranty, and lifetime after-care.

Supporting paragraphs: Mary Perkins Specsavers
Answer: Dame Mary Lesley Perkins