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Related Concept Videos

What is an Experiment?01:12

What is an Experiment?

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An experiment is a planned activity carried out under controlled conditions. The purpose of an experiment is to investigate the relationship between two variables. When one variable causes change in another, we call the first variable the explanatory or independent variable. The affected variable is called the response or dependent variable. In a randomized experiment, the researcher manipulates values of the explanatory variable and measures the resulting changes in the response variable. The...
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The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
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Crossover experiments, also called the repeated-measurements design, is a study design in which all experimental units are exposed to all treatments in different periods. Crossover experiments are generally used in psychology, the pharmaceutical industry, agriculture, and medicine.
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The famous and controversial Stanford Prison Experiment, conducted by social psychologist Philip Zimbardo and his colleagues at Stanford University, demonstrated the power of social roles, social norms, and scripts.
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[Giant retinal tears: Senegalese experience].

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Giant retinal tears are infrequent but can lead to detachment. Early diagnosis and treatment, including laser photocoagulation, improve outcomes, though prognosis remains guarded with delayed intervention.

Keywords:
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Area of Science:

  • Ophthalmology
  • Retinal Surgery

Background:

  • Giant retinal tears (GRTs) are a significant cause of retinal detachment.
  • Understanding their epidemiological characteristics is crucial for timely management.

Purpose of the Study:

  • To analyze the epidemiological features of giant retinal tears.
  • To evaluate the therapeutic outcomes for patients with GRTs.

Main Methods:

  • A retrospective study was conducted from January 2014 to June 2017.
  • Included patients diagnosed with giant retinal tears, excluding those with media opacities.

Main Results:

  • 17 cases of GRTs were identified, accounting for 17% of all retinal detachments.
  • The mean age was 50.75 years (M/F ratio 6.5), with common associations including high myopia and trauma.
  • All operated patients achieved anatomical reattachment and functional improvement, with a mean consultation delay of four weeks.

Conclusions:

  • The prognosis for giant retinal tears is guarded, particularly with delayed presentation and treatment.
  • Laser photocoagulation is an effective treatment, especially when diagnosed and treated early.