El óptico graduó la vista.

No. In this sentence, graduó does not mean graduated in the school sense.

With eyesight and glasses, graduar means something like:

• to test/check someone’s eyesight
• to determine the lens prescription
• to prescribe the correct strength

So El óptico graduó la vista means the optician checked/measured the person’s eyesight and worked out the prescription.

This is a good example of a false friend: graduar can sometimes mean to graduate, but in optical contexts it has a different meaning.

Graduó is the preterite form, third person singular:

• yo gradué
• tú graduaste
• él/ella/usted graduó

So it means he/she checked/measured or you (formal) checked/measured, depending on context.

In El óptico graduó la vista, it means:

• The optician checked/measured the eyesight

The preterite is used because the action is seen as a completed event in the past.

Because el óptico here means the optician as a specific person.

In Spanish, you normally use the definite article when a profession is being used as a noun:

• El médico llegó tarde. = The doctor arrived late.
• La profesora explicó el tema. = The teacher explained the topic.
• El óptico graduó la vista. = The optician checked the eyesight.

But after ser, professions usually appear without an article unless they are modified:

• Es óptico. = He is an optician.
• Es un óptico muy conocido. = He is a very well-known optician.

Spanish often uses the definite article with body parts and personal attributes when the owner is already clear from the context.

So la vista here means the eyesight, but in natural English we would often say my eyesight, his eyesight, etc., depending on context.

This is very common in Spanish:

• Me duele la cabeza. = My head hurts.
• Se lavó las manos. = He washed his hands.
• El óptico me graduó la vista. = The optician checked my eyesight.

If Spanish wants to make the person explicit, it often adds an indirect object:

• Me graduó la vista. = He checked my eyesight.
• Le graduó la vista al niño. = He checked the child’s eyesight.

They are related, but not always identical.

In this kind of sentence, vista means eyesight. That is very natural in everyday Spanish.

• tener buena vista = to have good eyesight
• perder vista = to lose eyesight

Visión is also vision, but it can sound a bit more technical, medical, or abstract depending on the context.

So in an optician’s context, la vista is the most everyday and idiomatic choice.

It is understandable and possible, but in everyday speech in Spain people often make the person affected more explicit.

Very natural alternatives are:

• El óptico me graduó la vista.
• El óptico le graduó la vista a mi padre.
• El óptico me revisó la vista.

The version without me/le is more general and slightly less personal, as if we are just stating what the optician did.

So the original sentence is fine, but in real conversation Spanish often prefers:

• El óptico me graduó la vista.

Because la vista is a thing, not a person.

Spanish uses the personal a mainly with specific human direct objects:

• Veo a María.
• Llamaron al médico.

But with things, no a is used:

• Revisó la vista.
• Compró unas gafas.

So la vista is the direct object, and it does not take the personal a.

In Spain, óptico often refers to the professional in the optical shop who deals with glasses, lenses, and often eyesight testing as well. In many everyday contexts, optician is the closest translation.

Depending on the exact situation, English may use:

• optician
• sometimes optometrist

But for a learner, optician is usually the safest everyday meaning for óptico in this sentence.

The most common way is to add an indirect object pronoun:

• El óptico me graduó la vista. = The optician checked my eyesight.
• El óptico te graduó la vista. = The optician checked your eyesight.
• El óptico le graduó la vista. = The optician checked his/her eyesight.

You can also make it extra clear:

• El óptico le graduó la vista a Ana.
• El óptico me graduó la vista a mí. (more emphatic)

This pattern is very common in Spanish: the body part or faculty uses the article, while the person is shown with me / te / le / nos / os / les.