REFRACTION

What is the working distance lens diopter required if the retinoscopy is performed at 67cm?

• +1.00DS

• +1.50DS

• +2.00DS

• +2.50DS

If both reflexes show with movement during retinoscopy, you should:

• Neutralize less with reflex first

• neutralize the brighter reflex first

• neutralize the dimmer reflex first

• neutralize with negative lens first

-2.50DS is needed to neutralize the reflex during retinoscopy without working distance lens at 67cm. What is the final prescription?

• -0.50DS

• -1.00DS

• -4.00DS

• -4.50DS

Choose the TRUE statement about duochrome test

• It is based on the principle of spherical aberration

• It can be used on patient with 6/24 VA.

• Give plus will shift the wavelength to the front.

• If the focus is behind the retina, the targets on the red side will appear clearer.

Choose the TRUE statement about subjective refraction.

• The longer the interval of Sturm, the smaller the circle of least confusion.

• We should refine power before the axis in JCC technique.

• Binocular balancing is to balance the spherical power between both eyes.

• BVS checking should be performed before and after JCC technique.