Conoid of Sturm-Clinical application

To understand the clinical application of Conoid of Sturm, we need to understand its basic optics.

In simple words, we can say ” Conoid of sturm is just a representation of how rays are refracted through two different powered meridians” (eg: a sphero- cylindrical lens). So, instead of one focal point, they form two focal lines.

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Working Distance Calculations in Retinoscopy

Static Retinoscopy can be done in two ways; using a working distance (WD) lens in front of the patient’s eye or without it.

A working distance lens is used to compensate for the distance between the examiner and the patient’s eye. Usually, the working distance is taken as arm length i.e 66cm (+1.50DS)

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