astigmatism   (Sound)

The astigmatism has 2 Senses.

• astigmatism, astigmia
• 乱視
• (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
• 通常、角膜の不規則な構造から生じる視力障害

• astigmatism, astigmia
• 非点収差
• (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
• 1点から発した光線を1つの焦点に集めることのできない、光学システムの欠陥