Reading Your Current Glasses (Lensometry)

iDoctor · Technology

Lensometry · Your current eyewear

Your glasses have
a story to tell.

When you bring your glasses, a lensometer lets our team read the prescription in the lenses. That information helps put your current vision and eyewear experience into context.

Same- and next-day appointments available.

Your current glasses provide a point of comparisonA simple drawing of glasses with light passing through a lens illustrates reading the optical power of existing lenses.Existing lens power
A lensometer reads the optical power in your existing lenses.

A useful point of comparison

Start with what
you already wear.

Your current glasses can help you explain what feels clear, comfortable or difficult. The lensometer reads the lenses so we can compare that information with your examination.

Read the existing lenses

A lensometer measures the optical power in the glasses you bring. It reads the eyewear, rather than measuring a new prescription from your eyes.

Discuss your experience

Tell us when the glasses work well and when they do not. Reading, screens, driving and progressive lenses may raise different questions.

Consider the next steps

Your doctor combines this background with your history, refraction and other examination findings. A lens reading is one piece of that assessment.

During your visit

Bring the glasses.
Bring your questions.

If you use more than one pair, bring the pairs you would like to discuss. It is helpful to explain how you use each one and what you notice when wearing them.

Share what you wear

Bring your current glasses, including reading or computer glasses you rely on.

Read the prescription

Our team uses the lensometer to read the prescription in the existing lenses.

Review your vision

The reading provides context for your discussion with Dr. Sayed and the rest of your examination.

Discuss a difficult prescription

A few helpful answers

Understanding a lens reading.

Does lensometry give me a new prescription?

No. It reads the prescription already present in your glasses. A current eye examination and prescription assessment serve a different purpose.

Should I bring glasses that have never felt right?

Yes. Bring them and explain what you notice. Comparing your existing eyewear with your experience and examination can help focus the discussion.

Is this the same as measuring my PD or frame fit?

No. Lensometry reads the existing lenses. Optikam measures how eyewear sits on you when you purchase glasses at iDoctor. We do not offer standalone PD measurements.

Personal care at iDoctor

Plan your visit.

Book your appointment

Call or text our team

(630) 454-6899

Schedule on your time

Same- and next-day appointments available.

Your first visit

Questions before booking?

Quick answers for your visit.

Team hours: Mon–Fri, 9 am–5 pm.
How do I book an eye exam?

Use our online scheduler to choose a date and review appointment options, even when the office is closed. Follow the steps in the scheduler to book your visit.

If your first selected day has no appointments, try another date. Open the online scheduler (opens in a new tab) →

Can’t find a suitable appointment?

If the scheduler doesn’t show a time that works for you, send our team your preferred days and times using the website contact form. We’ll follow up within one business day.

Sending a request does not reserve an appointment.

Which vision plans do you accept?

We accept major vision plans, including VSP, EyeMed, Davis Vision, Superior Vision, Spectera and NVA. Individual benefits, copays and allowances depend on your plan and require verification by our team.

View insurance information →

What if I don’t have vision insurance?

You can visit iDoctor with or without vision insurance. For current eye-exam and contact-lens service fees, send our team a question before your visit. We can also help you explore eyewear options for your budget.

What should I bring to my first visit?

Bring your current glasses or contact lenses, insurance card or plan information, photo ID and a list of your medications. Bring any questions you’d like to discuss, too.

How much time should I allow?

We schedule 30-minute eye exams so there is time for your questions. Allow extra time after the exam if you plan to choose glasses or contact lenses.

When will your team reply?

Our regular office hours are Monday–Friday, 9 am–5 pm, with weekends closed. We reply to form messages within one business day. Holiday hours may vary.

You can also call or text (630) 454-6899. Messages sent while we are closed are available for our team to review when we return.