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have good/poor eyesight
eyesight 通常作不可数名词，指视力；具体的好坏用 good、poor、excellent 等修饰。
She has excellent eyesight even in her seventies.
她七十多岁了视力依然极好。
视力；目力
先理解核心含义，再看它在真实句子里的用法。
视力；目力
the ability to see; vision
She has excellent eyesight even in her seventies.
她七十多岁了视力依然极好。
视力或视觉能力。
Vision or the faculty of sight.
正常的视力功能
normal use of the faculty of vision
视野或视力范围。
View or the range of vision.
Reading in dim light can strain your eyesight.
在昏暗的光线下阅读会损害你的视力。
The doctor said my eyesight is perfectly normal.
医生说我的视力完全正常。
His eyesight began to fail as he got older.
随着年龄增长，他的视力开始下降。
eyesight 通常作不可数名词，指视力；具体的好坏用 good、poor、excellent 等修饰。
She has excellent eyesight even in her seventies.
她七十多岁了视力依然极好。
lose one's eyesight 意为“失明”，比 become blind 更常用于事故或疾病语境。
He lost his eyesight in a car accident.
他在一场车祸中失明了。
描述视力变化时，常用 deteriorate、improve 等动词。
Her eyesight has deteriorated sharply over the past year.
过去一年里，她的视力急剧下降。
have your eyesight tested 用使役结构表示“请人检查视力”，比 get 更正式。
You should have your eyesight tested every two years.
你应该每两年检查一次视力。
Not this
I have a good eyesight.
Use this
I have good eyesight.
eyesight 是不可数名词，表示“视力”时前面不能加不定冠词 a；可以说 good/poor eyesight。
Not this
My eyesight is low.
Use this
My eyesight is poor.
英语中 eyesight 不与 low 搭配；表示“视力差”应用 poor（或 bad），不说 low eyesight。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
视力差
He has poor eyesight and needs glasses.
他视力差，需要戴眼镜。
衰退的视力
Her failing eyesight made reading difficult.
她衰退的视力使阅读变得困难。
失明
The accident caused the loss of his eyesight.
那次事故导致他失明。
视力检查
You should have an eyesight test every two years.
你应该每两年做一次视力检查。
好视力
Eagles are known for their good eyesight.
鹰以好视力著称。
保护视力
Wear sunglasses to protect your eyesight.
戴太阳镜以保护视力。
发长 /aɪ/ 音 (如 high, light)
Same pattern, same sound
Use eyesight naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
eyesight = eye（眼）+ sight（视力），合起来就是‘视力’；想象眼睛看清远处。
语域：neutral 常见场景：日常交流、体检或健康讨论 eyesight 通常是比较中性的常用词，多用于日常谈论看东西的能力，也常见于体检或健康讨论。
All six words contain the spelling chunk -ight and end with the sound /aɪt/, so they rhyme with the '-sight' part of 'eyesight' (/ˈaɪˌsaɪt/): sight, insight, delight, tonight, slight, light. Beware the lookalikes 'weight' (/weɪt/) and 'freight' (/freɪt/), which also end in -ight but are pronounced with /eɪt/, not /aɪt/.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.