This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Techniques of Ocular Examination and Diagnostic Tests, Subject name: Ophthalmology
Keratometer is used to assess: 
Select and explain. 
A. Thickness of cornea, B. Refractive power, C. Astigmatism, D. Curvature of cornea
D: Curvature of cornea
Answer: D: Curvature of cornea 
Explanation: Ans. (d) Curvature of corneaRef.: A.K. Khurana 6th ed. 1575Few Instruments Which are Used for Ocular ExaminationMeasurement parameterInstruments/for:* Corneal thicknessPachymeta* Corneal curvatureKeratometer* Angle of anterior chamberGonioscope* Corneal surfacePlacido disc* Corneal endotheliumSpecular microscope* Direct ophthalmoscopeRoutine fundus examination. "Image formed is Erect and Virtual and magnified15 times"* Rememberd as: "DEV"* Indirect ophthalmoscopeFor assessment of retinal detachment and other peripheral retinal lesions. The image is real, inverted and magnified 5 times.* PerimetryOptic nerve function