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Fundus drawing is universally acceptable records of the retinal disease process. It is a useful reference to monitor the clinical process and also at the time of surgery.
Requisites for Fundus drawing:
An examination table, indirect ophthalmoscope, 20 D lens, a scleral depressor (or paper clips etc), coloured pencils (mainly red, blue, green, yellow, black and brown), eraser, pencil sharpener, fundus drawing charts and a clipboard.
Fundus drawings are drawn in fundus chart. Generally there are three concentric circles-the innermost circle represent the areas of posterior to the equator, the middle one represent area in between equator and ora serrata and the outermost circle represent area anterior to the ora serrata.It is essential to draw the ophthalmoscopic observation in proper areas corresponding to the fundus. For example a lattice between ora serrata and equator should be drawn in between the innermost and middle circles. The optic nerve head is drawn as a small circle. The radial lines numbered in roman numerical used to designate the clock hours helps us to describe the location and extent of the lesions.
Generally the bottom right hand corner of the chart is kept near the patient’s right shoulder and this is done to overcome the difficulties arising from the inverted and reversed images perceived by the observer during indirect ophthalmoscopy.
It is always better to use a lead pencil to sketch the outlines of fundus drawing, as it can be erased and redrawn.However many a times the fundus drawings are drawn in prescription pad, outpatient cards and in case sheets of files. It’s better to use a circular stencil (like small bangle, cap of a container etc.) to draw the fundus as it looks good. The ora serrata is drawn as described in fig. -- as ora serrata is smoother in temporal side (11 to 5 o’clock in right eye and 7 to 1 o’clock in left eye).In eyes with mid dilated pupil and nondilated pupil, the obstructed view of peripheral fundus is indicated by some lines instead of the usual wavy pattern of drawing ora serrata.