How to use onclick in?

Question

JavaScript

Good afternoon.

Please tell me in the following question:
There is an online fitting of glasses, in which you can change the width of the frames using the buttons:

<button onclick="fitmixInstance.setPupillaryDistance(40)">40</button>
<button onclick="fitmixInstance.setPupillaryDistance(80)">80</button>

I want to make it a list using and :<select><option>

<select >
  <option value="-">Выбрать размер</option>
  <option onclick="fitmixInstance.setPupillaryDistance(40)">40</option>
  <option onclick="fitmixInstance.setPupillaryDistance(80)">80</option>
</select>

But nothing works... Help!

Answer 1

<select onchange="fitmixInstance.setPupillaryDistance(this.value)">
          <option value="40">40</option>
          <option value="80">80</option>
</select>