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13
5. Instrument heads - Ophthalmoscopes
Graticule Control (cont’d)
Glaucoma
Projects a graticule onto the retina to assess the optic
disc/cup ratio as an aid to glaucoma diagnosis and
monitoring.
Fixation Cross
Projects a graticule on to the retina for assessment of
the degree and direction of eccentric fixation. This is
particularly useful when examining children.
The Graticule Range for each ophthalmoscope is as follows:
Specialist
Professional
Practitioner
Standard
Filter Control*
The filter control is used to select the required filter.
(*Professional/Practitioner/Standard only.)
Filter Applications
Red Free (Green filter)
Is used to examine the blood vessels in fine detail. The
green filter blocks red rays showing blood vessels as
black against a dark green background. This filter is particularly
useful for diabetic retinopathy.
Cobalt Blue*
Is used in conjunction with flourescein dye for the
detection and examination of corneal scars and abrasions.
(*Practitioner and Specialist only).
Pupillometer*
Hold the pupillometer adjacent to the patients eye to
estimate pupil size. 1=1mm. The range is 1mm to 8mm.
(*Applies to Specialist only.)
