loạn thị kế
Definition
Noun: - Astigmometer: A medical instrument used by optometrists and ophthalmologists to measure the degree and axis of astigmatism in a person's eye. It is a key tool in determining the correct prescription for eyeglasses or contact lenses.
Usage Examples
- Noun:
- Bác sĩ sử dụng loạn thị kế để kiểm tra mắt tôi. (The doctor used an astigmometer to check my eyes.)
- Loạn thị kế là một thiết bị quan trọng trong phòng khám mắt. (The astigmometer is an important device in an eye clinic.)
Advanced Usage
- The term is highly specialized and used almost exclusively in professional medical or optical contexts. It is not used in everyday conversation.
Variants and Related Words
- Máy đo loạn thị: Another Vietnamese term for an astigmatism measuring device, often used interchangeably with "loạn thị kế."
- Astigmatism (n): The eye condition that an astigmometer measures, where the eye does not focus light evenly on the retina.
Synonyms
- Astigmatism tester: A descriptive synonym in English.
- Astigmatism gauge: Another term for an instrument that measures astigmatism.
Notes on Usage
- "Loạn thị kế" is a compound technical term. "Loạn thị" means "astigmatism," and "kế" means "meter" or "gauge." It should be treated as a single, fixed noun.
- This word is specific to the field of optometry. For general language learners, it is a low-frequency, specialized vocabulary item.