wǒ de shìlì hěn hǎo.

的 links a possessor to a noun. Here, 我 means I / me, and 我的视力 means my eyesight.

A very literal breakdown is:

• 我 = I / me
• 的 = possessive marker
• 视力 = eyesight / vision

So 我的视力 = my eyesight.

In Chinese, adjectives often need an adverb before them when they act as the predicate of a sentence.

So instead of saying:

• 我的视力好

Chinese often says:

• 我的视力很好

Here 很 can mean very, but in many everyday sentences it does not feel as strong as English very. Sometimes it is just there to make the sentence sound natural.

So in this sentence, 很好 can mean:

• very good
• or simply good, depending on context

Yes, but it changes the feel.

我的视力好 is grammatically possible, but it often sounds more contrastive, as if you are comparing:

• 我的视力好，他的视力不好。 My eyesight is good, but his is not.

Without 很, the sentence can sound like you are emphasizing a contrast or making a stronger assertion. With 很, it sounds more neutral and natural in ordinary conversation.

Because in Chinese, adjectives can directly describe the subject without needing 是.

English says:

• My eyesight is good.

But Chinese often says more literally:

• My eyesight very/good

So:

• 我的视力很好 = natural
• 我的视力是很好 = usually not correct as a basic statement

Use 是 mainly when connecting one noun to another noun, not normally before a simple adjective like 好.

For example:

• 我是学生。 = I am a student.
• 我很高兴。 = I am happy.

Not the same.

• 视力 = eyesight, visual acuity, vision quality
• 眼睛 = eyes

So 视力很好 means your vision is good, not that your eyes are physically beautiful or healthy in every possible sense.

For example:

• 我的眼睛很大。 = My eyes are big.
• 我的视力很好。 = My eyesight is very good.

Yes, very often you can.

Because 视力 is something closely associated with a person, 的 is often optional here:

• 我的视力很好
• 我视力很好

Both are natural. The version without 的 can sound slightly more direct and conversational. The version with 的 is also completely correct and clear.

This kind of omission is common with things closely related to a person, such as body parts, family relationships, and personal attributes.

The structure is:

• 我 的 视力 很 好
• my eyesight very good

So the pattern is:

• possessor + noun + degree word + adjective

More generally:

• Subject + 很 + adjective

Or, if the subject includes possession:

• 我的 + noun + 很 + adjective

Examples:

• 我的中文很好。 = My Chinese is very good.
• 他的身体很好。 = His health is very good.

Yes, there is a tone change in natural speech.

• 很 is normally third tone: hěn
• 好 is also third tone: hǎo

When two third tones come together, the first one usually changes to a rising tone in pronunciation. So 很好 is often pronounced more like:

• hén hǎo

But it is still written as hěn hǎo in pinyin.

This is a standard tone sandhi rule in Mandarin.

好 is a very common word with several meanings depending on context. In this sentence, it means good.

But in other sentences, 好 can also mean things like:

• good
• fine / well
• easy to
• ready to
• to like something in some older or formal uses

Here, though, 视力很好 clearly means eyesight is good.

It is natural and standard.

视力 is a normal word and is especially appropriate when talking about actual eyesight quality, such as whether you can see clearly or whether you need glasses.

In casual conversation, people might also say things like:

• 我视力很好。 = My eyesight is good.
• 我眼神不错。 = My eyes/vision are pretty good.
  This is more colloquial and can depend on context.

But 我的视力很好 is a very good standard sentence for learners to know.

Yes, it can imply that, depending on context.

If someone asks about your vision, saying 我的视力很好 suggests that your eyesight is good, so people may assume you do not need glasses or that you can see clearly.

But the sentence itself specifically states that your eyesight is good. It does not literally say:

• I don’t wear glasses
• or I don’t need glasses

If you want to say that more directly, you could use a different sentence.

It can be either, depending on emphasis and context.

In many beginner sentences, 很 is best understood as a neutral linker before an adjective. So 很好 may simply mean good in a natural sentence.

But if you stress it, it can absolutely mean very:

• 我的视力很好！ = My eyesight is very good!

So the same word can be weaker or stronger depending on how the sentence is said.