For ICO candidates · all four papers · 2026 cohort

Most apps tell you you’re ready. We tell you when you’re not.

ICO-calibrated MCQs with a BCSC paragraph one tap away, and an honest pass-probability that shrinks when you're confidently wrong. No 'AI'. No fake testimonials. No 4x-as-many-questions claims.

Start free · 30 cardsSee a real session
100 of 100 early-bird bundles remaining
Visual Sciences
Optics, Refraction & Instruments
Clinical Ophthalmology
Advanced (FICO)
§ Method

Two modes. One verified reference.

Built by a resident sitting for the same exams. The method is the product.

§ 01

Drill

Swipe through due cards in 25-minute focus sessions. Spaced repetition decides what comes next.

§ 02

Construct

Type your answer in prose. The instrument compares it to the reference. You get a verdict, not a vibe.

§ 03

Readiness

A single number, anchored to the curriculum. Updates after every session. Reads like a visual field.

§ Pricing

One bundle. One fair price.

You buy access to your exam, not a subscription you forget to cancel.

Exam bundle · first 100
USD99
USD 199 standard · one-time · 6 months
What's inside
  1. 01965 verified cards across 14 ICO areas
  2. 02Drill (spaced repetition) and Construct (prose evaluation), unlimited
  3. 036 months of access, expires 7 days after your exam
  4. 04New cards added weekly, included
  5. 05Export your data any time, in JSON
  6. 06No card required for the free preview
Bundles remaining100 / 100
Get the bundle · USD 99Try 30 cards first

One exam, one fair price. If you defer your exam, write to me and we will sort it out. (Amr)

§ Why this exists

Why this exists.

I sat the boards in 2025 and found nothing I trusted. Anki was honest but unstructured. The big platforms were polished but graded my answers for me. Dioptra is what I wished I had: a quiet instrument that disagrees with me when I am wrong.

- Amr Saad · Resident · Zürich

§ honest numbers

We hide nothing. Here’s the bank exactly as it is.

  • Verified MCQs published
    283
    grows weekly · changelog public
  • ICO blueprint domains touched
    14 / 14
    14 domains across 4 Parts
  • MCQs with primary citation
    100%
    283 / 283
  • BCSC paragraphs indexed
    soon
    ingest in progress

OphthoQuestions has 4,000+ MCQs. We don’t — yet. What we do have is BCSC-anchored, ICO-blueprint-mapped, and rated by a real psychometric model. We’d rather grow honestly than pad numbers.

§ Questions

Frequently asked, honestly answered.

How is this different from Anki or OphthoQuestions?

Anki asks you to rate your own answer. OphthoQuestions gives you an MCQ with a one-paragraph explanation and no "why not the others." DIOPTRA does both better: every question is a single-best-answer MCQ in the real ICO Part 2 format, every answer is adjudicated by the key (never by your memory), and every wrong option is itself a teaching unit - "this would be right when…". Spaced repetition runs underneath (FSRS), but the interaction is exam-shaped.

What does "verified reference" mean?

Every MCQ carries a citation to a primary source - BCSC chapter and page, Kanski's Clinical Ophthalmology edition and page, AAO Preferred Practice Patterns, or DOI-bearing landmark trials. The comparison is not "the internet said." It is "BCSC Sect. 8, p. 184 said." No speculation, no hallucinated clinical advice - if the reference does not cover the claim, the claim is absent.

Which ICO exam papers are covered?

All four. Visual Sciences (anatomy, physiology, pharmacology, genetics, pathology - the Standard / Basic Sciences paper), Optics · Refraction · Instruments, Clinical Ophthalmology, and Advanced. Each MCQ is tagged to ≥1 paper, and the readiness ring shows your coverage and accuracy per paper.

Can I keep access after my exam?

Exam Bundle expires seven days after your sitting date. If you defer the exam, email me and I extend access - no forms, no fees. The Annual plan is exam-unbound.

Is my data mine?

Yes. Export to JSON at any time from your settings. If you cancel, your history is portable.