التواصل البصري مهم.

A careful full pronunciation is:

at-tawāṣulu al-baṣariyyu muhimmun

In normal pausal pronunciation, you will often hear:

at-tawāṣul al-baṣarī muhimm

A few useful pronunciation notes:

• In التواصل, the الـ is followed by ت, which is a sun letter, so the l sound assimilates.
  So you say at-tawāṣul, not al-tawāṣul.
• In البصري, the الـ is followed by ب, which is a moon letter, so the l is pronounced normally:
  al-baṣarī.
• ص is an emphatic s sound: ṣ.
• مهم is pronounced roughly muhimm.

التواصل is a verbal noun (called a maṣdar) from the verb تواصل.

It means something like:

• communication
• contact
• interaction

So in this sentence, التواصل is the main noun, and البصري describes what kind of communication/contact it is.

No. This is not an iḍāfa.

It is:

• a noun: التواصل
• plus an adjective: البصري

So البصري is describing التواصل.

Why this matters:

• In an iḍāfa, the second word is another noun.
• Here, البصري is an adjective meaning visual or related to sight.

So this is a noun + adjective phrase, not a noun + noun possessive structure.

Because البصري is an adjective modifying التواصل, and in Arabic, adjectives must agree with the noun they describe in definiteness.

So:

• التواصل = definite
• البصري must also be definite

That is why you get:

• التواصل البصري

not

• التواصل بصري

This is standard adjective agreement in Arabic.

Literally, بصري means visual or related to sight/vision.

So التواصل البصري literally means something like:

• visual communication
• visual contact

In Modern Standard Arabic, this is the normal formal expression for eye contact.

A learner might expect something built directly from عين (eye), but Arabic often uses the broader adjective بصري in this fixed expression.

Because in Arabic, the verb to be in the present tense is usually not stated.

So:

• التواصل البصري مهم
• literally: eye contact important
• natural English: Eye contact is important

This is called a nominal sentence in Arabic.

If you wanted a past-tense version, then Arabic would use a verb, for example:

• كان التواصل البصري مهمًّا
• Eye contact was important

Because مهم is the predicate of the sentence, not an adjective inside the noun phrase.

The structure is:

• التواصل البصري = the subject
• مهم = the predicate, meaning important

In Arabic, predicates are often indefinite, so مهم without الـ is exactly what you expect here.

So the sentence pattern is:

• [definite subject] + [indefinite predicate]

That is very common in Arabic.

Because the subject is التواصل, and التواصل is grammatically masculine.

So the predicate agrees with it as masculine singular:

• التواصل ... مهم

not

• التواصل ... مهمة

This is an important point: grammatical agreement follows the actual Arabic noun التواصل, not the English idea behind it.

With full case endings, the sentence is:

التَّوَاصُلُ البَصَرِيُّ مُهِمٌّ

Here is why:

• التواصلُ = nominative, because it is the subject of a nominal sentence
• البصريُّ = nominative too, because it is an adjective describing التواصل
• مهمٌّ = nominative, because it is the predicate

In everyday speech and in most unvowelled writing, these endings are usually not pronounced, especially at the end of a pause.

Yes, that is possible, but it changes the feel slightly.

• التواصل البصري مهم sounds like a general statement about the concept: Eye contact is important.
• تواصل بصري مهم is more indefinite, more like visual communication/eye contact is important in a less specifically framed way.

For a general textbook-style statement, التواصل البصري مهم is the most natural version.