FINCHAM'S TEST
Emsley-Fincham stenopaeic slit is used in ophthalmology to differentiate between halos due to cornea and halos due to lens.
Halos due to cornea is seen in acute congestive glaucoma due to corneal oedema while lenticular halos(lens) are seen in immature senile cataracts.
To differentiate it stenopaeic slit is passed across the pupil, glaucomatous halos remain intact, while lenticular halos are broken in segments.
A lenticular halo (lens) will show a break in the halo, whereas a corneal halo will show reduced brightness (but no break) in the halo, thereby determining whether the patient suffers from cataract or from acute congestive glaucoma.
Stenopic Slit
A Stenopic slit has a small slit in between, and the patient is asked to look through. The coloured halo in:
1. Coloured Halos in Cataract
Split up & unite
2. Coloured Halos in Angle closure Glaucoma
Do not split
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