stigmatism

Thân thiện

A person with stigmatism wears corrective lenses to see clearly.

Definition

1. Noun:
   • Normal eyesight: The condition of having normal, sharp focus in vision, where light rays converge correctly on the retina.
   • Optics: The condition of an optical system (like a lens) in which rays of light from a single point converge to a single focal point, resulting in a clear image without distortion.
   • Medicine/Religion: The condition of having or being marked by stigmata; bodily marks or wounds corresponding to those of the crucified Jesus Christ.

Usage Examples

• Noun (Eyesight/Optics):
  • After her laser surgery, she achieved perfect stigmatism.
  • A high-quality camera lens is designed to provide stigmatism across the entire image frame.
• Noun (Medicine/Religion):
  • The nun was said to bear the stigmatism on her hands.

Advanced Usage

• In technical writing: The term is often used in contrast to "astigmatism." While "astigmatism" describes a common vision or optical defect, "stigmatism" describes the ideal, aberration-free state.
  • The design goal for the telescope's mirror is to achieve stigmatism for the target wavelength.

Variants and Related Words

• Astigmatism (n): A defect in the eye or a lens causing rays of light from a point to fail to meet in a single focal point, resulting in a blurred or distorted image. This is the direct antonym in optics and optometry.
• Stigmatic (adj): Relating to or marked by stigmata or a stigma.
• Stigma (n): A mark of disgrace; or, in botany, the part of a pistil that receives pollen.

Synonyms

• Normal vision (for the eyesight sense)
• Sharp focus (for the optical sense)
• Stigmata (for the religious sense, though this is the plural form of the specific marks)

Notes on Different Meanings

• The primary modern use in general contexts is within the field of optics and optometry, where it denotes the ideal state of focus. In everyday conversation about vision, its antonym "astigmatism" is far more commonly heard.
• The religious meaning is highly specific and used in theological or historical contexts.
• It is crucial not to confuse "stigmatism" with "astigmatism," as they are opposites in technical usage.

Học thuật

Noun

1. normal eyesight
2. (optics) condition of an optical system (as a lens) in which light rays from a single point converge in a single focal point
3. the condition of having or being marked by stigmata