Optikeren tilpasser brillestellet, så pasformen er god.

Those endings are the definite article in Danish, attached to the end of the noun instead of standing as a separate word.

• optiker = optician

• optikeren = the optician

• pasform = fit

• pasformen = the fit

• brillestel = eyeglass frame
• brillestellet = the eyeglass frame

Very roughly:

• common-gender nouns often take -en
• neuter nouns often take -et

So Danish often says the + noun as one word.

Optikeren means the optician.

The base noun is optiker, meaning an optician or someone who works with glasses and vision correction. The ending -en makes it definite: the optician.

Here tilpasser means something like adjusts, fits, or adapts.

In this sentence, the most natural idea is that the optician is adjusting the frame so it fits properly.

The verb is:

• infinitive: at tilpasse = to adjust / to adapt / to fit
• present tense: tilpasser = adjusts / is adjusting

Danish present tense often covers both simple present and present progressive, depending on context.

Because Danish, like English, often forms compound nouns, but Danish usually writes them as one word.

So:

• brille = glasses / lens-related element
• stel = frame
• brillestel = eyeglass frame
• brillestellet = the eyeglass frame

This is very common in Danish. If English might write something as two words, Danish will often write it as one.

Because briller means glasses, but the frame is still thought of as one single frame.

Also, in compounds, Danish often uses a base form as the first part of the word, not necessarily the exact form you would expect from the standalone noun.

So even though briller is plural in everyday use, brillestel is the normal compound for eyeglass frame.

Here så means so or so that.

It links the two parts of the sentence:

• Optikeren tilpasser brillestellet
• så pasformen er god

So the sense is:

• the optician adjusts the frame, so that the fit is good
• or: the optician adjusts the frame, so the fit is good

In context, it can express either result or purpose.

Yes. så pasformen er god is functioning as a subordinate clause.

A useful thing to know is that Danish main clauses normally follow V2 word order (the finite verb comes early in second position), but subordinate clauses do not behave the same way.

In this sentence, the clause after så looks simple because there is no adverb like ikke. But if there were one, you could see the subordinate structure more clearly:

• så pasformen ikke er god = so that the fit is not good

Notice how ikke comes before er in the subordinate clause.

Pasformen means the fit.

The base noun is pasform, which means how well something fits the body or face. In this sentence it refers to how well the glasses frame fits the person wearing it.

So:

• pasform = fit
• pasformen = the fit

Because the adjective agrees with pasformen, which is a common-gender singular noun.

After er, Danish adjectives still agree with the noun they describe:

• common gender singular: god
• neuter singular: godt
• plural or definite contexts: gode

So here:

• pasformen is singular and common gender
• therefore: pasformen er god

Literally, it mentions the frame: brillestellet.

That suggests the physical adjustment is being made to the frame itself, for example:

• how it sits on the nose
• how the sides fit
• how it rests behind the ears

The second part, så pasformen er god, explains the goal: the fit should be good.

So the sentence is specifically about adjusting the frame to improve the fit.