Ismail K Jalili

FRCS, DO, FRCOphth

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  Efficiency of red-tinted filter (glasses) in retinal dystrophies
I K Jalili, S Sen
The Efficacy of red Filter in cone disorders

This work was carried out during blind schools survey in the West Bank and Gaza Strip between 1985-1987.

Ismail K Jalili

The efficacy of red transmittance 550 nm as compared to ordinary dark-tinted glasses was assessed in 24 diagnosed cases of congenital retinal dystrophy (cone-rod dystrophy 14, rod-cone dystrophy 2, rod-monochromatism 5 and central areolar dystrophy 3). Independent observers evaluated improvements in (a) visual acuity on Sheridan Gardiner testing in normal day light illumination; (b) photophobia as assessed by reduction in blinking and orbicularis spasms and (c) subjective comfort. Twelve out of 14 (86%) cases of cone-rod dystrophy and 3 out of 5 (60%) of patients with rod monochromatism (achromatopsia) demonstrated marked improvement on all three parameters with red as compared to dark glasses. Only 2 cases (14%) of cone-rod dystrophy preferred dark tinted over red glasses. There was no change with any kind of glasses in all the three cases of central areolar choroidal dystrophy, as well as the 2 cases of rod-cone dystrophy. In spite of the small sample size, it seems that patients with cone-rod dystrophy especially in its early stages would benefit from red glasses by cutting down the short and middle wave length radiation, red glasses will attenuate the ambient illumination that would otherwise saturate the patient’s rods, and thus prevent him from seeing in normal daylight illumination.

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Acknowledgements

Ms Jennie Wescher, Orthoptist; Mr Abu Khalid, Optician; St John's Eye Hospital Blind Schools survey team; Al-Khalil Friends of the Sick Society for their donations towards red-tinted glasses to patients with cone and cone-rod (CRD) disorders.

Also Mr RM Sen, FRCOphth, Ophthalmologist at Warrington Hospital for analysing the data and presenting them as a poster at the Royal College of Ophthalmologists Conference, Harrogate, 1993.

 

Address for Correspondence:

Ismail K Jalili
68 Roman Bank,
Stamford,
PE9 2ST,
UK

ikjalili.co

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Ismail K Jalili 2000-2016