Astigmatisme veroorsaak dowwe visie.

Yes. This sentence follows the normal subject–verb–object pattern:

• Astigmatisme = subject
• veroorsaak = verb
• dowwe visie = object

So it maps neatly to Astigmatism causes blurred vision.

Because Afrikaans verbs do not change the way English verbs do for he/she/it in the present tense.

In English, you say:

• I cause
• they cause
• it causes

In Afrikaans, the verb usually stays the same:

• ek veroorsaak
• hulle veroorsaak
• dit veroorsaak

So Astigmatisme veroorsaak ... is exactly what you would expect.

Veroorsaak means cause or bring about.

It is a very normal word in formal, medical, and scientific Afrikaans. In a sentence like this, it sounds natural because the topic is medical:

• Astigmatisme veroorsaak dowwe visie.
• Stres veroorsaak hoofpyn. = Stress causes headache.

So yes, it is a direct and useful verb to learn.

Because Afrikaans adjectives often change form when they come before a noun.

The basic adjective is dof or a related stem, but before a noun you commonly get the attributive form dowwe:

• die visie is dof = the vision is dull/blurred
• dowwe visie = blurred vision

So dowwe is the form used in front of visie.

This kind of -e ending is very common in Afrikaans adjectives.

Because Afrikaans often leaves out the article when talking about something in a general, abstract, or medical way.

Here dowwe visie is being treated like a symptom or condition, much like English blurred vision. English also often says:

• Astigmatism causes blurred vision

not necessarily

• Astigmatism causes a blurred vision

So the lack of 'n is natural here.

It can be, but many speakers would also use sig for eyesight.

So these are both understandable:

• dowwe visie
• dowwe sig

Depending on context, visie can also mean vision in the sense of foresight or a vision/idea of the future, just like in English. In this sentence, though, the medical context makes the meaning clear.

A rough English-friendly pronunciation would be:

as-TIKH-ma-TIS-muh fe-rohr-SAAK DAW-vuh FEE-see

A few notes:

• The g in Astigmatisme is usually the guttural Afrikaans sound, like the ch in Scottish loch.
• The v in Afrikaans is often pronounced close to f.
• aa in veroorsaak is a long vowel.
• ie in visie sounds like ee.

You do not need a perfect accent to be understood, but those features help.

You use the Afrikaans double nie:

Astigmatisme veroorsaak nie dowwe visie nie.

That literally looks like:

• subject
• verb
• nie
• object
• nie

This double negative pattern is one of the most important grammar features in Afrikaans.

Yes. It is in the present tense, but in Afrikaans, just like in English, the present tense is often used for general facts or scientific truths.

So this sentence does not only mean something happening right now. It means a general medical fact:

Astigmatisme veroorsaak dowwe visie.

Yes, several of them are helpful cognates or near-cognates:

• Astigmatisme ≈ astigmatism
• visie ≈ vision

The least obvious word is veroorsaak, but once you learn it, you will see it often in formal Afrikaans.

So for an English speaker, this sentence is actually quite approachable.