astigmatism
astigmatism — 名詞
1. a medical condition in which the front surface of the eye is not evenly curved,
散光
角膜不規則導致視力模糊
a medical condition in which the front surface of the eye is not evenly curved, so objects at any distance appear unclear, stretched, or out of focus
Mei's eye doctor told her that her astigmatism could be corrected with special contact lenses.
Mei 的眼科醫生告訴她，她的散光可以透過特殊隱形眼鏡來矯正。
corrected with contact lenses
A routine eye test showed that Hugo has mild astigmatism in both eyes.
例行視力檢查發現 Hugo 的雙眼都有輕微散光。
Children with undiagnosed astigmatism may struggle to read the board at school.
孩子如果有散光卻沒被發現，在學校可能看不清楚黑板上的字。
Anong had laser surgery to fix the astigmatism and no longer needs glasses.
Anong 接受了雷射手術矯正散光，現在不再需要戴眼鏡。
Heloísa's astigmatism made road signs hard to read while she drove at night.
Heloísa 的散光讓她開車在夜間行駛時難以看清路標。
- blurred vision
describes the symptom rather than the underlying eye condition; less precise
文法句型
have/develop astigmatism
be diagnosed with astigmatism
correct astigmatism
用法筆記
Frequently used without an article: 'She has astigmatism.' With an article ('the astigmatism') it refers to a specific case, as in 'the astigmatism in his right eye.'
常見錯誤
2. a defect in an optical device such as a camera, microscope, or telescope in whic
像散
光學系統光線無法聚焦
a defect in an optical device such as a camera, microscope, or telescope in which the lens or mirror cannot focus all the light from a single point onto one sharp dot, so parts of the image stay blurry no matter how the focus is adjusted
Devika's new camera lens had astigmatism, so no matter how carefully she adjusted the focus, the edges stayed blurry.
Devika 的新相機鏡頭有像散，無論她多仔細調整焦距，邊緣部分還是模糊不清。
astigmatism in camera lenses
Minho returned the telescope because astigmatism in its main lens made stars appear stretched.
Minho 退還了望遠鏡，因為主透鏡的像散使得星星看起來被拉長了。
Astrid adjusted the projector's focus wheel, but astigmatism in the lens kept the text at the edges looking stretched.
Astrid 轉了投影機的對焦環，但鏡片的像散讓邊緣的文字看起來被拉長了。
The technician at the camera shop said astigmatism in the wide-angle lens was causing uneven sharpness across the photos.
相機維修店的技師說，廣角鏡頭的像散導致照片中清晰度不均。
- lens aberration
broader term that includes astigmatism along with other optical faults
文法句型
astigmatism in [optical device]
reduce astigmatism
cause astigmatism
用法筆記
In optics, 'astigmatism' is one of several lens aberrations (along with spherical aberration and coma). It is an uncountable noun even when describing a specific device: 'the lens has astigmatism.'