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Obtaining a letter from your eye doctor to verify your vision typically involves these steps:

Schedule an Eye Exam:
The first and most crucial step is to schedule a comprehensive eye exam with your optometrist or ophthalmologist.  
During this exam, your eye doctor will assess your visual acuity, eye health, and any refractive errors.
Explain Your Needs:
Clearly communicate to your eye doctor or their staff the reason you need the letter.
Specify if the letter is for a driver’s license, employment, or any other specific purpose.
If there are specific vision requirements for your situation, provide those to your eye doctor.
Request a Vision Report or Letter:
Ask your eye doctor to provide a written report or letter that includes:
Your visual acuity (e.g., 20/20, 20/40).
Whether you require corrective lenses.
Any relevant medical conditions related to your eyes.
A statement that your vision meets the necessary requirements.
Specific Forms:
In some cases, especially for driver’s licenses or certain occupations, there may be specific forms that your eye doctor needs to complete.  
Ensure you have any required forms with you during your appointment. For example, some departments of motor vehicles have their own vision forms.  
Follow Up:
After your exam, confirm with your eye doctor’s office when you can expect to receive the letter or completed form.
Important Considerations:

Regulations Vary: Vision requirements and the necessary documentation can vary depending on your location and the purpose of the eye test.  
Accurate Information: Be sure to provide your eye doctor with accurate information, and be honest about any vision problems you may be experiencing.
Legal Documents: In some cases, these documents become part of a legal record. Therefore it is important that the information provided is correct.
I hope this information is helpful.