Free Part 1 FRCOphth Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Part 1 FRCOphth practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1Which structure occupies the space between the crystalline lens and the retina in the posterior two-thirds of the eyeball?

   1. A.Aqueous humour
   2. B.Vitreous gelCorrect answer: B
   3. C.Ciliary body
   4. D.Choroidal tissue

   Explanation: The NEI describes vitreous gel as a mass that "fills the rear two-thirds of the eyeball, between the lens and the retina." This identifies the posterior gel-filled compartment; aqueous occupies the anterior segment.

   Reference: NEI: Parts of the Eye — p. 2, Vitreous gel

2. 2During a cover-uncover test, covering the fixing eye causes the other, previously uncovered eye to move to take up fixation. What does this demonstrate?

   1. A.A manifest deviation of the previously uncovered eyeCorrect answer: A
   2. B.Normal alignment maintained during binocular viewing
   3. C.A refractive error without ocular misalignment
   4. D.A latent deviation confined to the covered eye

   Explanation: The Academy states: "When the fixing eye is occluded, the examiner will observe the nonoccluded eye move to pick up fixation if a tropia is present." Movement of that eye reveals a tropia, rather than only a latent phoria.

   Reference: AAO EyeWiki: Cover Tests — Cover-Uncover Test

3. 3A small lesion selectively damages the retinal region responsible for central vision. Which anatomical region is involved?

   1. A.Optic disc
   2. B.Ciliary body
   3. C.MaculaCorrect answer: C
   4. D.Ora serrata

   Explanation: The NEI states: "Macula: The macula is the small, sensitive area of the retina that gives central vision." The lesion therefore localises to the macula, rather than the optic disc or a peripheral retinal boundary.

   Reference: NEI: Parts of the Eye — p. 2, Macula

4. 4What does a fully dissociating alternate cover test assess?

   1. A.The manifest deviation with fusion maintained
   2. B.The latent deviation without its manifest component
   3. C.The total deviation, including tropia and phoriaCorrect answer: C
   4. D.The difference between the tropia and phoria angles

   Explanation: The Academy states: "The alternate cover test is the most dissociative cover test and measures the total deviation, which includes the tropia plus the phoria." Dissociation exposes the latent as well as the manifest component.

   Reference: AAO EyeWiki: Cover Tests — Alternate Cover Test

5. 5Which anatomical structure carries visual impulses from the retina towards the brain?

   1. A.Optic nerveCorrect answer: A
   2. B.Oculomotor nerve
   3. C.Trochlear nerve
   4. D.Abducens nerve

   Explanation: The NEI states of the optic nerve: "It carries impulses for sight from the retina to the brain." The other named cranial nerves primarily supply extraocular muscles rather than carrying the retinal visual signal.

   Reference: NEI: Parts of the Eye — p. 2, Optic nerve

6. 6In an alternate prism cover test, what is the endpoint used to quantify the deviation?

   1. A.The prism that halves the refixation movement
   2. B.The prism that neutralises the refixation movementCorrect answer: B
   3. C.The prism that maximises the refixation movement
   4. D.The prism that reverses the refixation movement

   Explanation: The Academy states: "The magnitude of the deviation is the measurement of the prism in prism diopters required to neutralize the deviation." The endpoint is elimination of refixation movement. Residual movement indicates undercorrection; reversal indicates overcorrection rather than neutralisation.

   Reference: AAO EyeWiki: Cover Tests — Alternate Prism Cover Test

7. 7Which clear anterior structure forms the outermost part of the eye's focusing system?

   1. A.Crystalline lens
   2. B.Vitreous body
   3. C.Optic disc
   4. D.CorneaCorrect answer: D

   Explanation: The NEI states: "Cornea: The cornea is the clear outer part of the eye’s focusing system located at the front of the eye." The crystalline lens is an internal focusing structure; the vitreous and optic disc do not form the clear anterior surface.

   Reference: NEI: Parts of the Eye — p. 2, Cornea

8. 8A stereopsis test is used to assess which visual ability?

   1. A.Monocular colour naming
   2. B.Dark-adapted light detection
   3. C.Accommodation of the crystalline lens
   4. D.Depth perception from binocular image disparityCorrect answer: D

   Explanation: The Academy explains that the two eyes view objects from slightly different angles and states: "The brain processes these differences and integrates them into the one image we see." Stereopsis uses those differences for binocular depth perception, rather than assessing monocular colour or dark adaptation.

   Reference: AAO: What Is Stereopsis? — Answer

9. 9Loss of the oily outer layer of the tear film most directly impairs which function?

   1. A.Adhering mucus to the ocular surface
   2. B.Reducing evaporation from the tear filmCorrect answer: B
   3. C.Producing aqueous within the globe
   4. D.Draining tears into the nasal cavity

   Explanation: The NEI states: "The oily outer layer keeps tears from drying up too quickly and makes the surface of the eyes smooth." Its loss therefore favours evaporation; mucus adherence and nasolacrimal drainage are different functions.

   Reference: NEI: How Tears Work — What are tears made of?

10. 10Which corneal measurement is provided by pachymetry during anterior-segment assessment?

    1. A.The radius of curvature of the cornea
    2. B.The thickness of the corneaCorrect answer: B
    3. C.The horizontal diameter of the cornea
    4. D.The refractive power of the cornea

    Explanation: Moorfields states: "Corneal pachymetry measures the thickness of your cornea." Thickness is distinct from corneal radius of curvature, horizontal diameter and refractive power.

    Reference: Moorfields: Hospital eye tests and examinations — Corneal pachymetry