Causes and prevalence of visual impairment among adults in the United States.

OBJECTIVES: To estimate the cause-specific prevalence and distribution of blindness and low vision in the United States by age, race/ethnicity, and gender, and to estimate the change in these prevalence figures over the next 20 years. METHODS: Summary prevalence estimates of blindness (both according to the US definition of < or =6/60 [< or =20/200] best-corrected visual acuity in the better-seeing eye and the World Health Organization standard of < 6/120 [< 20/400]) and low vision (< 6/12 [< 20/40] best-corrected vision in the better-seeing eye) were prepared separately for black, Hispanic, and white persons in 5-year age intervals starting at 40 years. The estimated prevalences were based on recent population-based studies in the United States, Australia, and Europe. These estimates were applied to 2000 US Census data, and to projected US population figures for 2020, to estimate the number of Americans with visual impairment. Cause-specific prevalences of blindness and low vision were also estimated for the different racial/ethnic groups. RESULTS: Based on demographics from the 2000 US Census, an estimated 937 000 (0.78%) Americans older than 40 years were blind (US definition). An additional 2.4 million Americans (1.98%) had low vision. The leading cause of blindness among white persons was age-related macular degeneration (54.4% of the cases), while among black persons, cataract and glaucoma accounted for more than 60% of blindness. Cataract was the leading cause of low vision, responsible for approximately 50% of bilateral vision worse than 6/12 (20/40) among white, black, and Hispanic persons. The number of blind persons in the US is projected to increase by 70% to 1.6 million by 2020, with a similar rise projected for low vision. CONCLUSIONS: Blindness or low vision affects approximately 1 in 28 Americans older than 40 years. The specific causes of visual impairment, and especially blindness, vary greatly by race/ethnicity. The prevalence of visual disabilities will increase markedly during the next 20 years, owing largely to the aging of the US population.

Prevalence of cataract and pseudophakia/aphakia among adults in the United States.

OBJECTIVES:

To determine the prevalence of cataract and pseudophakia/aphakia in the United States and to project the expected change in these prevalence figures by 2020.

METHODS:

Summary prevalence estimates of cataract and of pseudophakia/aphakia were prepared separately for black, white, and Hispanic persons (for whom only cataract surgery data were available) in 5-year age intervals starting at 40 years for women and men. The estimates were based on a standardized definition of various types of cataract: cortical, greater than 25% of the lens involved; posterior subcapsular, present according to the grading system used in each study; and nuclear, greater than or equal to the penultimate grade in the system used. Data were collected from major population-based studies in the United States, and, where appropriate, Australia, Barbados, and Western Europe. The age-, gender-, and race/ethnicity-specific rates were applied to 2000 US Census data, and projected population figures for 2020, to obtain overall estimates.

RESULTS:

An estimated 20.5 million (17.2%) Americans older than 40 years have cataract in either eye, and 6.1 million (5.1%) have pseudophakia/aphakia. Women have a significantly (odds ratio = 1.37; 95% confidence interval, 1.26-1.50) higher age-adjusted prevalence of cataract than men in the United States. The total number of persons who have cataract is estimated to rise to 30.1 million by 2020; and for those who are expected to have pseudophakia/aphakia, to 9.5 million.

CONCLUSION:

The number of Americans affected by cataract and undergoing cataract surgery will dramatically increase over the next 20 years as the US population ages.

The prevalence of refractive errors among adults in the United States, Western Europe, and Australia.

OBJECTIVE:

To estimate the prevalence of refractive errors in persons 40 years and older.

METHODS:

Counts of persons with phakic eyes with and without spherical equivalent refractive error in the worse eye of +3 diopters (D) or greater, -1 D or less, and -5 D or less were obtained from population-based eye surveys in strata of gender, race/ethnicity, and 5-year age intervals. Pooled age-, gender-, and race/ethnicity-specific rates for each refractive error were applied to the corresponding stratum-specific US, Western European, and Australian populations (years 2000 and projected 2020).

RESULTS:

Six studies provided data from 29 281 persons. In the US, Western European, and Australian year 2000 populations 40 years or older, the estimated crude prevalence for hyperopia of +3 D or greater was 9.9%, 11.6%, and 5.8%, respectively (11.8 million, 21.6 million, and 0.47 million persons). For myopia of -1 D or less, the estimated crude prevalence was 25.4%, 26.6%, and 16.4% (30.4 million, 49.6 million, and 1.3 million persons), respectively, of whom 4.5%, 4.6%, and 2.8% (5.3 million, 8.5 million, and 0.23 million persons), respectively, had myopia of -5 D or less. Projected prevalence rates in 2020 were similar.

CONCLUSIONS:

Refractive errors affect approximately one third of persons 40 years or older in the United States and Western Europe, and one fifth of Australians in this age group.

Prevalence of open-angle glaucoma among adults in the United States.

OBJECTIVE:

To estimate the prevalence and distribution of open-angle glaucoma (OAG) in the United States by age, race/ethnicity, and gender.

METHODS:

Summary prevalence estimates of OAG were prepared separately for black, Hispanic, and white subjects in 5-year age intervals starting at 40 years. The estimated rates were based on a meta-analysis of recent population-based studies in the United States, Australia, and Europe. These rates were applied to 2000 US census data and to projected US population figures for 2020 to estimate the number of the US population with OAG.

RESULTS:

The overall prevalence of OAG in the US population 40 years and older is estimated to be 1.86% (95% confidence interval, 1.75%-1.96%), with 1.57 million white and 398 000 black persons affected. After applying race-, age-, and gender-specific rates to the US population as determined in the 2000 US census, we estimated that OAG affects 2.22 million US citizens. Owing to the rapidly aging population, the number with OAG will increase by 50% to 3.36 million in 2020. Black subjects had almost 3 times the age-adjusted prevalence of glaucoma than white subjects.

CONCLUSIONS:

Open-angle glaucoma affects more than 2 million individuals in the United States. Owing to the rapid aging of the US population, this number will increase to more than 3 million by 2020.

Trends in Approval Times for Genetically Engineered Crops in the United States and the European Union

Genetically engineered (GE) crops are subject to regulatory oversight to ensure their safety for humans and the environment. Their approval in the European Union (EU) starts with an application in a given Member State followed by a scientific step (risk assessment), and ends with a political decision-making step (risk management); and in the United States (US) it starts with a scientific (field trial) step and ends with a ‘bureaucratic’ decision-making step. We investigated trends for the time taken for these steps and the overall time taken for approving GE crops in the US and the EU (traders in these commodities). Results show that from 1996-2015 the overall time trend for approval in the EU decreased and then flattened off, with an overall mean completion-time of 1,763 days. In the US in 1998 there was a break in the trend of the overall approval time: Initially, from 1988 until 1997 the trend decreased with a mean approval time of 1,321 days; from 1998-2015, the trend almost stagnated with a mean approval time of 2,467 days.

The sectionalism of the tariff bill. Speech of Hon. John L. McLaurin, of South Carolina, in the Senate of the United States

This document contains a speech by John L. McLaurin, representative of South Carolina. Sections of the speech include: sectionalism exposed, the bill might have been defeated, the south plundered of its rights, not a protectionist, fraudulent demands of New England, Hon. Randolph Tucker, Hon. W.R. Morrison, and Hon. R.Q. Mills strangers to the doctrine in 1882, a tariff for revenue against the doctrine of free raw material, don’t want Cleveland’s interpretation, contest of schedules, and my remedy.

Speech of Hon. John Lowndes McLaurin, of South Carolina, in the Senate of the United States, Monday, December 9, 1901

This document contains a speech by John L. McLaurin of South Carolina presented in the Senate of the United States. Sections of the speech include: sectionalism the cause, conditions in South Carolina, the federal administration in South Carolina, should not array class against class, freedom of thought and speech, the issues, under caucus dictation the Senate no longer a deliberative body, the beginning of the fight, matter of arraying class against class, freedom of thought and speech, and issues.

Consolidation. An account of parties in the United States, from the convention of 1787, to the present period

This document is an account of a convention of South Carolina state representatives following the drafting of the Declaration of Independence. There were three parties involved in the convention and the account is based on the notes of Mr. Luther Martin who attended as well Mr. Justice Yates’ account. The first party wished to abolish all state governments and have one uniform monarchical government for the continent that would be restricted and limited. The second party did not wish to abolish state governments to give their own state some importance. The third party was advocating for a federal government in conjunction with state government. This document is an account of the convention.

Speech of Hon. James H. Hammond, of South Carolina, on the relation of states; delivered in the Senate of the United States, May 21, 1860

The speech is a response by Hon. James H. Hammond as to whether or not the territorial governments established by Congress have the power to define and declare what shall be and what shall not be property within the territorial boundaries. The speech goes on to discuss colonists who went to newly purchased territory and claimed land as their own. He argues whether or not these people have sovereignty of the land over the government.

Speech of Hon. John Lowndes McLaurin, of South Carolina, in the Senate of the United States, Monday, December 9, 1901

This speech is to address the statement that Mr. McLaurin has been excluded from the caucuses of his party and thus that he will be without assignment on any committee. He goes on to explain his exclusion and defend his views that led to his exclusion.

Speech of Mr. Calhoun, of South Carolina, on the slavery question. Delivered in the Senate of the United States, March 4, 1850

The speech addresses the question, how can the union be preserved? He goes on to explain the threats to the union and give suggestions for how the threats can be handled.

Stable standard essential for prosperity. Speech in the Senate of the United States, February 4, 1878

This speech was given when the United States Senate was considering a bill to authorize the free coinage of the standard silver dollar and to restore its legal tender character. Mr. Bayard argues against the bill in this speech. He is interrupted during his speech multiple times and questioned about his points.

Liberalization of Labor Relations in Germany and the United States: A firm-centered comparison of cross-national labor organizing at Amazon and Volkswagen

Thesis (Master's)--University of Washington, 2015

The resilience of democratic institutions in Britain, Australia and the United States under conditions of total war

To what extent are democratic institutions resilient when nation states mobilise for war? Normative and empirical political theorists have long argued that wars strengthen the executive and threaten constitutional politics. In modern democracies, national assemblies are supposed to hold the executive to account by demanding explanations for events and policies; and by scrutinising, reviewing and, if necessary, revising legislative proposals intended to be binding on the host society or policies that have been implemented already. This article examines the extent to which the British and Australian parliaments and the United States Congress held their wartime executives to account during World War II. The research finds that under conditions approaching those of total war, these democratic institutions not only continued to exist, but also proved to be resilient in representing public concerns and holding their executives to account, however imperfectly and notwithstanding delegating huge powers. In consequence, executives—more so British and Australian ministers than President Roosevelt—were required to be placatory as institutional and political tensions within national assemblies and between assemblies and executives continued, and assemblies often asserted themselves. In short, even under the most onerous wartime conditions, democratic politics mattered and democratic institutions were resilient.