Sign up to Eye Conditions Explained to ask questions, solve cases, and expand your knowledge. Create a profile and connect with eye-care professionals from all over the world. 🌎
We want to empower everyone to share their knowledge for the benefit of the entire community. Let people who need your help find you.
Lost your password? Please enter your email address and we will send a new Password at your email. You can change your Password any time from your profile.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
In retinoscopy, a −2.00 D against motion is neutralized with a +2.00 D lens at 67 cm. The patient’s refractive error is:
A. −0.50 D
B. Plano
C. +0.50 D
D. −1.00 D
Explanation: Working distance compensation is required. At 67 cm, add +1.50 D to the neutralizing lens. Against motion means myopia, so the patient is −2.00 D (against motion) + +2.00 D (neutralizing) − +1.50 D (working distance) = +0.50 D hyperopic.
Which structure is MOST responsible for aqueous humor production?
A. Trabecular meshwork
B. Non-pigmented ciliary epithelium
C. Pigmented ciliary epithelium
D. Iris pigment epithelium
Explanation: The non-pigmented ciliary epithelium (NPE) actively secretes aqueous humor via carbonic anhydrase and ion transport. The pigmented layer provides the blood-aqueous barrier but doesn’t primarily produce aqueous.
Question: A patient with a 4Δ exophoria at near experiences asthenopia. The BEST diagnostic test to assess fusional reserves is:
A. Red lens test
B. Prism bar vergences
C. Maddox wing
D. Titmus stereo test
Answer: B. Prism bar vergence testing measures fusional convergence and divergence amplitudes. This directly assesses the patient’s ability to compensate for the phoria. Low fusional reserves explain asthenopia despite small deviation.
Question: Which finding is MOST characteristic of Brown syndrome?
A. Limited elevation in adduction
B. Limited elevation in abduction
C. Limited depression in adduction
D. Exotropia increasing at near
Answer: A. Brown syndrome is a restrictive condition of the superior oblique tendon sheath. It presents with limited active and passive elevation in adduction due to inability of the superior oblique to lengthen during this gaze position. It’s often congenital but can be acquired.
A 25-year-old presents with blurred distance vision but clear near vision. Retinoscopy reveals a refractive error of −2.50 D in both eyes. Which diagnosis best fits these findings?
A. Mild Hyperopia
B. Mild Myopia
C. Moderate Myopia
D. Presbyopia
C. is correct because a refractive error of −2.50 D in both eyes typically falls into the moderate myopia category in many clinical classifications. Myopia occurs when the optical power of the eye is too strong relative to its length, or when the eye is too long relative to its focusing power, causing light from distant objects to focus in front of the retina rather than on it. As a result, distance vision is blurred while near vision remains clearer. In the case described, the patient’s main complaint is blurred distance vision with relatively good near vision, which is characteristic of myopia. The numerical value of −2.50 D indicates more than very mild myopia, so it is reasonable to categorize it as moderate.
A patient reports seeing halos around lights and has a painful red eye with decreased vision. Intraocular pressure is markedly elevated. Which diagnosis is most likely?
Acute angle-closure glaucoma is correct because typically it presents with sudden onset of severe ocular pain, a red eye, blurred or decreased vision and characteristic halos around lights due to corneal edema. In this condition, the anterior chamber angle becomes blocked, preventing normal outflow of aqueous humor and causing a rapid rise in intraocular pressure. The corneal edema scatters light, creating halos, and the high pressure can lead to nausea, vomiting, and headache as well. This is an ophthalmic emergency because prolonged elevated IOP can quickly damage the optic nerve, potentially leading to permanent vision loss.
Create an account to comment or publish your own post.