Что касается линз, то антибликовое покрытие важно.

Что касается is a set expression meaning as for, regarding, or when it comes to.

So:

• Что касается линз... = As for lenses...
• Что касается цены... = As for the price...

It is very commonly used to introduce a topic before making a comment about it.

Because что касается requires the genitive case.

The basic noun is:

• линза = lens

Its plural nominative is:

• линзы = lenses

But after что касается, you need the genitive plural:

• линз

So:

• Что касается линз... = As for lenses...

This is something worth memorizing as a pattern:

• что касается + genitive

For example:

• Что касается очков... = As for glasses...
• Что касается оправы... = As for the frame...

Here, то is a linking or highlighting particle. It helps divide the sentence into:

• the topic: Что касается линз
• the comment: антибликовое покрытие важно

So the structure is roughly:

• As for lenses, [then/as for that], anti-reflective coating is important.

In natural English, we usually do not translate то separately. It just helps the Russian sentence sound more organized and natural.

You will often see this pattern:

• Что касается X, то Y.

The то is often optional, but very common.

Yes. You can say:

• Что касается линз, антибликовое покрытие важно.

This is still correct.

Adding то makes the topic-comment structure clearer and often sounds a bit smoother or more formal. So both are possible, but что касается X, то Y is a very standard pattern.

Because важно is the short form of the adjective важный, used as a predicate meaning is important.

Compare:

• важное покрытие = an important coating
  
  • here the adjective describes the noun directly, so you use the full form
• покрытие важно = the coating is important
  
  • here the adjective is the predicate, so Russian commonly uses the short form

Since покрытие is neuter singular, the short form is:

• masculine: важен
• feminine: важна
• neuter: важно
• plural: важны

So:

• антибликовое покрытие важно = anti-reflective coating is important

Yes, from an English point of view, it may feel like something is missing. In Russian, the verb to be is usually omitted in the present tense.

So:

• покрытие важно literally looks like coating important
• but it means the coating is important

This is completely normal in Russian.

Compare:

• Это полезно. = It is useful.
• Очки дорогие. = The glasses are expensive.
• Покрытие важно. = The coating is important.

Антибликовое means anti-glare or anti-reflective.

It is built from:

• анти- = anti-
• блик = glare, light reflection, glint

So антибликовое покрытие is literally something like anti-glare coating.

This adjective is in the neuter singular form because it agrees with покрытие, which is a neuter singular noun.

Because it modifies покрытие, and adjectives in Russian must agree with the noun in gender, number, and case.

The noun is:

• покрытие = coating

This noun is:

• neuter
• singular
• here in the nominative case

So the adjective must match:

• антибликовое покрытие

If the noun changed, the adjective would change too. For example:

• антибликовая линза = an anti-glare lens
• антибликовые линзы = anti-glare lenses

The grammatical subject of the second clause is:

• антибликовое покрытие

And the predicate is:

• важно

The first part, Что касается линз, is not the subject. It is a topic-setting phrase meaning as for lenses.

So the sentence structure is basically:

• As for lenses, anti-reflective coating is important.

Yes, Russian word order is flexible, but not every version sounds equally natural.

The original:

• Что касается линз, то антибликовое покрытие важно.

is a clear, natural topic-comment structure.

You could also say:

• Антибликовое покрытие важно, что касается линз.

but this sounds much less natural in most contexts.

If you want to emphasize the coating itself, you might say something like:

• Для линз важно антибликовое покрытие.

That is a slightly different structure and nuance: For lenses, anti-reflective coating is important.

So yes, word order can change, but the original is a very standard and natural way to frame the idea.

It is not extremely formal, but it is a bit more structured and written-sounding than very casual everyday speech.

It is common in:

• explanations
• presentations
• articles
• careful spoken Russian

In casual conversation, people might also use other expressions depending on context, but что касается is very useful and common enough that learners should know it well.

Yes, absolutely.

Depending on context, good English translations include:

• As for lenses, anti-reflective coating is important.
• When it comes to lenses, anti-reflective coating is important.
• Regarding lenses, anti-reflective coating is important.

All of these capture the basic meaning of что касается линз. The Russian itself is a topic-setting phrase, so the best English translation depends on style and context.