Mindblown: a blog about philosophy.
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With-the-rule astigmatism
Astigmatism in which the eye has more refractive power in the vertical meridian than in the horizontal meridian.
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Simple astigmatism
Astigmatism along one meridian only.
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Mixed astigmatism
Astigmatism in which one meridian is myopic and the other hyperopic.
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Index astigmatism
Astigmatism resulting from inequalities in the refractive indices of different parts of the lens.
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Compound astigmatism
Astigmatism in which both horizontal and vertical curvatures are involved.
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Against-the-rule astigmatism
Astigmatism in which the eye has greater refractive power in the horizontal than in the vertical meridian.
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Unstable asthma
An increase in asthmatic symptoms during the past 4 weeks.
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Stable asthma
Asthma in which there has been no increase in symptoms or need for additional medication for at least the past 4 weeks.
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Nocturnal asthma
An increase in asthmatic symptoms during sleep. Nocturnal asthma may be caused by a variety of conditions, including gastroesophageal reflux, allergens in the bedroom, circadian variations in circulating hormone levels, or inadequate doses of antiasthmatic medications at night. Treatment is tailored to the underlying cause.
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Baker’s asthma
A colloquial term for reactive airway disease caused by inhalation of airborne wheat proteins in occupational settings.
Got any book recommendations?