This instrument can be used in all except-

Stenopaeic slit The rectangular apeure is 1mm in width and 15mm in length. Uses of the stenopaeic slit - Determination of Meridian Of Optical Iridectomy- in patients with a corneal scar or lenticular opacity. To diagnose cases of cataract, differentiate between colored halos caused in Angle-closure glaucoma and cataract by Fincham'stest. Determine power and axis of the cylinderical lens- The slit apeure acts as an elongated 'pin-hole', only allowing light in the axis of the slit to enter the eye. Hence, when the slit lies in one principal axis of the astigmatism eye, the second line focus is eliminated and the blur of sturm's conoid reduced thus allowing a clearer image to be formed.