lão thị

Ông cụ đeo kính lão thị để đọc tờ báo.

Definition

1. Noun (Medical/Optometry):
   • Presbyopia: An age-related vision condition where the eye gradually loses its ability to focus on nearby objects, typically becoming noticeable after middle age. It is caused by a hardening of the lens inside the eye, reducing its flexibility.

Usage Examples

• Noun:
  • Ông ấy bắt đầu đeo kính để đọc sách vì chứng lão thị. (He started wearing glasses for reading because of presbyopia.)
  • Lão thị là một quá trình tự nhiên của lão hóa. (Presbyopia is a natural process of aging.)
  • Cô ấy phẫu thuật để điều chỉnh tật lão thị. (She had surgery to correct her presbyopia.)

Advanced Usage

• The term is used specifically in medical and optometric contexts. It is distinct from other refractive errors like myopia (nearsightedness) or hyperopia (farsightedness), which can occur at any age.

Variants and Related Words

• Viễn thị (n): Hyperopia or farsightedness, a different refractive error where distant vision is clearer than near vision, which can affect younger people.
• Lão hóa mắt (n): Eye aging, a broader term that encompasses presbyopia and other age-related changes.

Synonyms

• Presbyopia: The direct and most accurate medical synonym.
• Age-related farsightedness: A descriptive synonym in layman's terms.

Related Terms (Not Idioms)

• Kính lão (n): Reading glasses, used to correct presbyopia.
  • Bà tôi luôn để kính lão trên bàn. (My grandmother always keeps her reading glasses on the table.)
• Điều tiết mắt (n): Accommodation of the eye, the process that declines with presbyopia.