Penglihatan Nenek masih baik.

Yes. Penglihatan is a noun related to lihat or melihat, which mean to see. In this sentence, penglihatan means vision, eyesight, or sense of sight.

So it refers to the ability to see, not just the physical eyes themselves.

This is how possession is commonly expressed in Indonesian.

The pattern is:

thing possessed + possessor

So:

penglihatan Nenek = Grandma's eyesight

Indonesian does not need an apostrophe plus s, and it does not need of here.

When nenek is used like a name or family title for a specific person, it is often capitalized, just like Grandma in English.

So:

• Nenek = Grandma, referring to a specific person
• nenek = grandmother or an old woman in a general sense

In this sentence, the capital letter suggests it means Grandma rather than just a grandmother in general.

Masih means still.

It shows that the condition continues up to now. So the sentence does not just say that Grandma's eyesight is good; it says that it is still good.

That often suggests a contrast with what someone might expect, especially because of age or the passage of time.

Because Indonesian often leaves out the verb to be when linking a subject to an adjective or noun.

So where English says:

Grandma's eyesight is still good

Indonesian simply says:

Penglihatan Nenek masih baik

This is a complete and normal sentence in Indonesian.

Here, baik means good.

It describes the condition of her eyesight. So masih baik means that her eyesight is still in good condition.

In other contexts, baik can also mean things like well, fine, kind, or proper, depending on the sentence.

You might hear it, but baik is the more natural choice here.

For physical condition, health, ability, or functioning, baik is often better. With eyesight, baik sounds neutral and appropriate.

Bagus more often means something like nice, great, or excellent, and it is often used for appearance, quality, or something aesthetically pleasing.

So for this sentence, baik is the safer and more natural word.

Because penglihatan and mata are not exactly the same.

• mata = eyes, the body part
• penglihatan = vision / eyesight, the ability to see

This sentence is talking about how well Grandma can see, so penglihatan is a precise choice.

If you say mata Nenek, that refers more directly to Grandma's eyes themselves.

Yes. Nenek can mean grandmother, but in some contexts it can also refer to an old woman.

However, in this sentence, because it is capitalized as Nenek, the most natural reading is Grandma as a specific person.

If it were lowercase, the meaning would depend more on context.

A natural way is:

Penglihatan nenek saya masih baik.

Here, nenek saya means my grandmother.

Notice that Indonesian still keeps the same possession order:

penglihatan + nenek saya

So literally it is structured like:

eyesight + my grandmother

It is neutral and perfectly natural.

Penglihatan sounds a little more precise or slightly more formal than everyday body-part vocabulary, but the full sentence is very normal Indonesian.

In more casual speech, someone might choose a different wording, but this sentence is clear, correct, and natural.