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The test may be presented as either a Visual or Auditory test, but both measure the same variables. During the first section of the test, the objective is to measure attention during a boring task. For adults, this section is 10.8 minutes long and the non-target is presented 3.5 times for every 1 time a target is presented.
ADHD inattentive type: Must score either a 2 or 3 on six or more items in questions 1–9, and score of 1 or 2 on any items in the performance section. ADHD hyperactive/impulsive type: Must score either a 2 or 3 on six or more items in questions 10–18, and a score of 1 or 2 on any items in the performance section.
This lens consisted of two cylindrical lenses, one plano-convex and one plano-concave, which be rotated in opposite directions. In 1887 Edward Jackson described the use of modified Stokes' lens in detecting astigmatism, and in 1907 he described the determination of the axis of a correcting cylinder in astigmatism using a cross cylinder. [7]
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The Adult ADHD Self-Reporting Scale (ASRS) was created to estimate the pervasiveness of an adult with ADHD in an easy self survey. [ 4 ] The ASRS was developed in conjunction with the World Health Organization (WHO), and the Workgroup on Adult ADHD which included researchers from New York University Medical School and Harvard Medical School .
A meta-analysis of the global prevalence of ADHD in adults, published in 2021, estimated a collective prevalence of persistent adult ADHD of 2.58% globally in 2020. [4] Persistent adult ADHD is defined as meeting diagnostic criteria for ADHD in adulthood with the additional requirement of a confirmed childhood diagnosis. [4]
The number of people globally with refractive errors has been estimated at one to two billion. [4] Rates vary between regions of the world with about 25% of Europeans and 80% of Asians affected. [4] Near-sightedness is the most common disorder. [6] Rates among adults are between 15 and 49% while rates among children are between 1.2 and 42%. [7]