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Systematic Error: Methodological and Sampling Errors01:15

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In the case of systematic errors, the sources can be identified, and the errors can be subsequently minimized by addressing these sources. According to the source, systematic errors can be divided into sampling, instrumental, methodological, and personal errors.
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According to some social psychologists, people tend to overemphasize internal factors as explanations—or attributions—for the behavior of other people. They tend to assume that the behavior of another person is a trait of that person, and to underestimate the power of the situation on the behavior of others. They tend to fail to recognize when the behavior of another is due to situational variables, and thus to the person’s state. This erroneous assumption is...
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Random or indeterminate errors originate from various uncontrollable variables, such as variations in environmental conditions, instrument imperfections, or the inherent variability of the phenomena being measured. Usually, these errors cannot be predicted, estimated, or characterized because their direction and magnitude often vary in magnitude and direction even during consecutive measurements. As a result, they are difficult to eliminate. However, the aggregate effect of these errors can be...
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The margin of error is also called the maximum error of an estimate. The margin of error is the maximum possible or expected difference between the observed sample parameter value and the actual population parameter value. For proportion, it is the maximum difference between the value of sample proportion obtained from the data and the true value of population proportion. As the true value of the population parameter is not known, the margin of error is calculated using the sample statistic.
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Effective sample preparation is crucial for accurate and reliable laboratory analysis. During this process, two significant sources of error can arise: concentration bias from improper sample splitting and contamination caused by methods used to reduce particle size, such as grinding or homogenization. Identifying and minimizing these potential errors is crucial to ensuring the validity of the analysis.
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The sampling variability of a statistic is defined as how much the statistic varies from one sample to another. The sampling variability of a statistic is typically measured by measuring its standard error.
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Cortical Cataract and Refractive Error.

Ralph Michael1,2, Luis Pareja-Aricò3,4, Franziska G Rauscher5,6

  • 1Centro de Oftalmología Barraquer, Barcelona, Spain, ralphm@barraquer.com.

Ophthalmic Research
|March 29, 2019
PubMed
Summary
This summary is machine-generated.

Emmetropes and hyperopes are more prone to developing cortical cataracts than myopes. This suggests that accommodation efforts may contribute to cortical cataract formation in the crystalline lens.

Keywords:
AccommodationCortical cataractPresbyopiaRefraction

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Biomedical Optics

Background:

  • Cataracts are a leading cause of vision impairment globally.
  • Cortical cataracts, a specific type, affect the lens cortex.
  • Understanding the etiology of different cataract types is crucial for prevention and treatment.

Purpose of the Study:

  • To investigate the association between cortical cataract presence and accommodation effort.
  • To use refractive error as a proxy measure for accommodation effort.

Main Methods:

  • A cohort of 239 patients (50-90 years) scheduled for cataract surgery was analyzed.
  • Cataracts were graded (nuclear and cortical), and patients categorized.
  • Refractive error was estimated at age 45 to infer accommodation demands.

Main Results:

  • Cortical cataracts were more prevalent in emmetropes (82%) and hyperopes (85%) compared to myopes (37%).
  • Eyes with no cataract had the lowest median refractive error (-3.65 dpt).
  • Pure cortical (-0.23 dpt) and mixed cataracts (-0.87 dpt) were closer to emmetropia.

Conclusions:

  • Emmetropia and hyperopia are associated with a higher incidence of cortical cataracts.
  • Accommodation effort, particularly during presbyopia onset, may induce shear stress leading to cortical cataracts.