Context: Canada (French: ) is a country in the northern half of North America. Its ten provinces and three territories extend from the Atlantic to the Pacific and northward into the Arctic Ocean, covering , making it the world's second-largest country by total area and the fourth-largest country by land area. Canada's border with the United States is the world's longest land border. The majority of the country has a cold or severely cold winter climate, but southerly areas are warm in summer. Canada is sparsely populated, the majority of its land territory being dominated by forest and tundra and the Rocky Mountains. About four-fifths of the country's population of 36 million people is urbanized and live near the southern border. Its capital is Ottawa, its largest city is Toronto; other major urban areas include Montreal, Vancouver, Calgary, Edmonton, Quebec City, Winnipeg and Hamilton., Toronto is the most populous city in Canada, the provincial capital of Ontario, and the centre of the Greater Toronto Area, the most populous metropolitan area in Canada. Growing in population, the 2011 census recorded a population of 2,615,060. As of 2015, the population is now estimated at 2,826,498, making Toronto the fourth-largest city in North America based on the population within its city limits. Toronto trails only Mexico City, New York City, and Los Angeles by this measure, while it is the fifth-largest (behind also Chicago) if ranked by the size of its metropolitan area . An established global city, Toronto is an international centre of business, finance, arts, and culture, and widely recognized as one of the most multicultural and cosmopolitan cities in the world., Vancouver General Hospital (locally known as VGH, or Vancouver General) is a medical facility located in Vancouver, British Columbia. It is the largest facility in the Vancouver Hospital and Health Sciences Centre (VHHSC) group of medical facilities. VGH is Canada's second largest hospital, after The Ottawa Hospital., Kelowna is a city on Okanagan Lake in the Okanagan Valley, in the southern interior of British Columbia, Canada. It serves as the head office of the Regional District of Central Okanagan. Its name derives from an Okanagan language term for "grizzly bear". Kelowna is the third largest metropolitan area in the province and ranks as the 22nd largest in Canada, with a population of 179,839 in 2011. Nearby communities include the City of West Kelowna (also referred to as Westbank, Westside) to the west across Okanagan Lake, Lake Country and Vernon to the north, as well as Peachland to the southwest and, further to the south, Summerland and Penticton., Winnipeg is the capital and largest city of the province of Manitoba in Canada. It is located near the longitudinal centre of North America, at the confluence of the Red and Assiniboine Rivers., FOREST (short for "Freedom Organisation for the Right to Enjoy Smoking Tobacco") is a United Kingdom political pressure group which campaigns against tobacco control activity., Vancouver, officially the City of Vancouver, is a coastal seaport city on the mainland of British Columbia, Canada, and the most populous city in the province., British Columbia (BC) is the westernmost province of Canada, with a population of more than four million people located between the Pacific Ocean and the Rocky Mountains. 
British Columbia is also a component of the Pacific Northwest and the Cascadia bioregion, along with the U.S. states of Idaho, Oregon, Washington and Alaska., McGill University is an English and French-language public research university in Montreal, Quebec, Canada, ranked among the world's top 30 institutions. It was established in 1821 by royal charter, issued by King George IV of Great Britain. The University bears the name of James McGill, a prominent Montreal merchant from Scotland whose bequest in 1813 formed the university's precursor, McGill College., The pupil is a hole located in the centre of the iris of the eye that allows light to strike the retina. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil., The Rocky Mountains, commonly known as the Rockies, are a major mountain range in western North America. The Rocky Mountains stretch more than from the northernmost part of British Columbia, in western Canada, to New Mexico, in the southwestern United States. Within the North American Cordillera, the Rockies are somewhat distinct from the Pacific Coast Ranges and the Cascade Range and Sierra Nevada which all lie further to the west., An eye examination is a series of tests performed by an ophthalmologist (medical doctor), optometrist, or orthoptist assessing vision and ability to focus on and discern objects, as well as other tests and examinations pertaining to the eyes.
Health care professionals often recommend that all people should have periodic and thorough eye examinations as part of routine primary care, especially since many eye diseases are asymptomatic., Ottawa is the capital city of Canada. It stands on the south bank of the Ottawa River in the eastern portion of southern Ontario. Ottawa borders Gatineau, Quebec; the two form the core of the OttawaGatineau census metropolitan area (CMA) and the National Capital Region (NCR). The 2011 census reported a population of 883,391, making it the fourth-largest city in Canada; and 1,236,324 within the CMA, making it the fourth-largest CMA in Canada. The City of Ottawa reported that the city had an estimated population of 960,754 as of December 2015., A research university is a university that expects all its tenured and tenure-track faculty to continuously engage in research, as opposed to merely requiring it as a condition of an initial appointment or tenure. Such universities can be recognized by their strong focus on innovative research and the prestige of their brand names. On the one hand, research universities strive to recruit faculty who are the most brilliant minds in their disciplines in the world, and their students enjoy the opportunity to learn from such experts. On the other hand, new students are often disappointed to realize their undergraduate courses at research universities are overly academic and fail to provide vocational training with immediate "real world" applications; but many employers value degrees from research universities because they know that such coursework develops fundamental skills like critical thinking. , The University of British Columbia, commonly referred to as UBC, is a public research university with campuses and facilities in British Columbia, Canada. Founded in 1908 as the McGill University College of British Columbia, the university became independent and adopted its current name in 1915. It is British Columbia's oldest institution of higher learning and has over 60,000 students at its Vancouver and Okanagan Valley campuses. Most students are enrolled in five larger faculties: Arts, Science, Medicine, Applied Science and the Sauder School of Business.
UBC's Vancouver campus is within the University Endowment Lands, about west of Downtown Vancouver. The Okanagan campus, acquired in 2005, is in Kelowna., Quebec City (pronounced or ) officially Québec) is the capital city of the Canadian province of Quebec. In 2015 the city had a population estimate of 545,485, and the metropolitan area had a population of 806,400, making it Canada's seventh-largest metropolitan area and Quebec's second-largest city after Montreal, which is about to the southwest. , A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation". The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light "coherently". Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography. Spatial coherence also allows a laser beam to stay narrow over great distances (collimation), enabling applications such as laser pointers. Lasers can also have high temporal coherence, which allows them to emit light with a very narrow spectrum, i.e., they can emit a single color of light. Temporal coherence can be used to produce pulses of light as short as a femtosecond., The Ottawa Hospital is a non-profit, public university teaching hospital in Ottawa, Canada. The hospital is made up of the former Grace Hospital, Riverside Hospital, Ottawa General Hospital and Ottawa Civic Hospital. It is a 1,117-bed academic health sciences centre affiliated with the University of Ottawa, and the University of Ottawa Heart Institute is located at the hospital's Civic Campus. The Ottawa Hospital is also one of two trauma centres in Eastern Ontario and southern Quebec. The other is Children's Hospital of Eastern Ontario accommodating juvenile and adolescent patients., Glaucoma is a group of eye diseases which result in damage to the optic nerve and vision loss. The most common type is open-angle glaucoma with less common types including closed-angle glaucoma and normal-tension glaucoma. Open-angle glaucoma develops slowly over time and there is no pain. Side vision may begin to decrease followed by central vision resulting in blindness if not treated. Closed-angle glaucoma can present gradually or suddenly. The sudden presentation may involve severe eye pain, blurred vision, mid-dilated pupil, redness of the eye, and nausea. Vision loss from glaucoma, once it has occurred, is permanent.
Risk factors for glaucoma include increased pressure in the eye, a family history of the condition, migraines, high blood pressure, and obesity. For eye pressures a value of greater than is often used with higher pressures leading to a greater risk. However, some may have high eye pressure for years and never develop damage. Conversely, optic nerve damage may occur with normal pressure, known as normal-tension glaucoma. The mechanism of open-angle glaucoma is believed to be slow exit of aqueous humor through the trabecular meshwork while in closed-angle glaucoma the iris blocks the trabecular meshwork. Diagnosis is by a dilated eye examination. Often the optic nerve shows an abnormal amount of cupping.
If treated early it is possible to slow or stop the progression of disease with medication, laser treatment, or surgery. The goal of these treatments is to decrease eye pressure. A number of different classes of glaucoma medication are available. Laser treatments may be effective in both open-angle and closed-angle glaucoma. A number of types of glaucoma surgeries may be used in people who do not respond sufficiently to other measures. Treatment of closed-angle glaucoma is a medical emergency.
About 11 to 67 million people have glaucoma globally. The disease affects about 2 million people in the United States. It occurs more commonly among older people. Closed-angle glaucoma is more common in women. Glaucoma has been called the "silent thief of sight" because the loss of vision usually occurs slowly over a long period of time. Worldwide, glaucoma is the second-leading cause of blindness after cataracts. The word "glaucoma" is from ancient Greek "glaukos" which means blue, green, or gray. In English, the word was used as early as 1587 but did not become commonly used until after 1850, when the development of the ophthalmoscope allowed people to see the optic nerve damage., Vancouver Hospital and Health Sciences Centre (VHHSC) is an acute care hospital affiliated with the University of British Columbia and located in Vancouver, British Columbia. The VHHSC is the second largest hospital in Canada, with 1,900 beds and nearly 116,000 patients each year. VHHSC employs 9500 staff and utilizes 1000 volunteers. As of 2005, the hospital's annual budget is $463 million. It is managed by Vancouver Coastal Health., Montreal officially Montréal in both Canadian English and French, is the most populous municipality in Quebec and the 2nd-most populous in Canada. Originally called "Ville-Marie", or "City of Mary," it is named after Mount Royal, the triple-peaked hill in the heart of the city. The city is on the Island of Montreal, which took its name from the same source as the city, and a few much smaller peripheral islands, the largest of which is Île Bizard. It has a distinct four-season continental climate with warm to hot summers and cold snowy winters., Stephen Michael Drance OC FRSC ( born 22 May 1925 ) is Emeritus Professor of Ophthalmology , University of British Columbia . He was the head of glaucoma service at the Eye Care centre of Vancouver General Hospital , Vancouver , BC , Canada Drance was born on the 22nd of May 1925 in Bielsko , Poland . In the 1930s he emigrated to Great Britain where he finished the secondary school and later studied in Edinburgh . He completed his medical studies at the University of Edinburgh in 1948 and one year later , in 1949 , gained his clinical diploma ( MD ) . In 1953 he obtained the diploma in Ophthalmology , in London . He continued his ophthalmological training in York , Edinburgh and Oxford . In 1957 Drance moved to Canada , where he became an Assistant Professor at the University of Saskatchewan . In 1963 he became an Associate Professor at the University of British Columbia in Vancouver . It was at this University in 1966 , that he gained the position of Professor and in 1973 Head of the Department of Ophthalmology , which he held until his retirement in 1990 . Drance has more than 300 contributions to the glaucoma literature spanning half a century and address every conceivable aspect of the disease , along with being the co-author of five books . The Eye Care Centre was established in Vancouver in 1983 due to the eight million dollars Drance helped raise . For 18 years , he served as Chairman of the University of British Columbia 's Department of Ophthalmology , and merged clinical care seamlessly into an environment of teaching and research . Professor Drance has trained 35 fellows , whose contributions continue to move glaucoma care forward . His accomplishments have been widely recognized , through numerous honorary fellowships , honorary degrees and awards . In 1987 , Drance was appointed as an Officer of the Order of Canada , one of the highest honors his country bestows . His passion for music and the visual arts led him to found the Vancouver Summer Festival , and this year he received the Vancouver Arts Award in recognition of his philanthropy in the arts . In 2012 , he was awarded the Queen Elizabeth II Diamond Jubilee Medal . Drance 's expertise has taken him around the world . He has been a visiting professor or guest lecturer across Canada and the United States as well as in Australia , New Zealand , France , Mexico , England , Panama , Germany , the Netherlands , Belgium , Japan , Poland , Italy , Greece , the Czech Republic and Hungary ., Downtown Vancouver is the southeastern portion of the peninsula in the north-central part of the City of Vancouver. It is the business, commercial, cultural, financial, government, and entertainment centre of the city and the Metro Vancouver and Lower Mainland regions., Calgary is a city in the Canadian province of Alberta. It is situated at the confluence of the Bow River and the Elbow River in the south of the province, in an area of foothills and prairie, about east of the front ranges of the Canadian Rockies. In the 2011 census, the City of Calgary had a population of 1,096,833 and a metropolitan population of 1,214,839, making it the largest city in Alberta, and the third-largest municipality and fifth-largest census metropolitan area (CMA) in Canada., In physical geography, tundra is a type of biome where the tree growth is hindered by low temperatures and short growing seasons. The term "tundra" comes through Russian  ("tûndra") from the Kildin Sami word "tndâr" "uplands", "treeless mountain tract". There are three types of tundra: Arctic tundra, alpine tundra, and Antarctic tundra. In tundra, the vegetation is composed of dwarf shrubs, sedges and grasses, mosses, and lichens. Scattered trees grow in some tundra regions. The ecotone (or ecological boundary region) between the tundra and the forest is known as the tree line or timberline., Subject: stephen m. drance, Relation: occupation, Options: (A) academic (B) bank (C) canada (D) commercial (E) entertainment (F) faculty (G) general (H) major (I) mountain (J) ophthalmologist (K) pupil (L) research (M) thief (N) united kingdom
Output: ophthalmologist