Definition

1. Noun:
   • Ophthalmometer: A medical instrument used for measuring the curvature of the cornea of the eye, particularly for assessing astigmatism. This is a specialized technical term.

Usage Examples

• Noun:
  • Bác sĩ sử dụng nhãn chiết kế để đo độ cong giác mạc. (The doctor uses an ophthalmometer to measure the curvature of the cornea.)
  • Nhãn chiết kế là một dụng cụ quan trọng trong nhãn khoa. (The ophthalmometer is an important tool in ophthalmology.)

Advanced Usage

• The term is highly specialized and used almost exclusively in medical, optical, and ophthalmological contexts. It is not used in everyday conversation.

Variants and Related Words

• Máy đo độ cong giác mạc: This is a descriptive Vietnamese phrase meaning "corneal curvature measuring device," which is functionally equivalent to an ophthalmometer.
• Ophthalmometry (nhãn chiết kế pháp): The measurement process performed with the instrument.

Synonyms

• Keratometer: A more modern and commonly used English synonym for the same instrument.

Notes

• "Nhãn chiết kế" is a compound Sino-Vietnamese medical term. "Nhãn" means eye, "chiết" means to refract or bend, and "kế" means meter or gauge. It directly translates to "eye refraction gauge."
• This term is very rare in general language use and is primarily found in technical literature or clinical settings.