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Astigmia (Noun)

(optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point.

Nouns denoting natural processes.

The lens exhibited astigmia, causing blurry images at the edges of the photograph.
The optician carefully adjusted the eyepiece to correct the astigmia in the telescope.
Astigmia in the microscope's objective lens made it difficult to obtain clear images of the microscopic samples.
The camera's manufacturer issued a recall due to a design flaw that caused astigmia in the lens.
The astronomer spent hours calibrating the telescope to minimize the effects of astigmia on the images of distant galaxies.

(ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people.

Nouns denoting natural processes.

People who have severe astigmia may experience distorted or blurred vision at all distances, which can affect their daily activities.
Astigmia can be caused by an irregularly shaped cornea or lens inside the eye, and it often occurs in combination with nearsightedness or farsightedness.
Correcting astigmia typically involves using corrective lenses, such as glasses or contact lenses, or undergoing refractive surgery to reshape the cornea.
The optometrist prescribed a new pair of glasses to correct the patient's astigmia, which had worsened over the past year.
Untreated astigmia can lead to eye strain and headaches, so it's essential to schedule regular eye exams to monitor the condition.