89 e-Letters

published between 2007 and 2010

  • Authors' Reply
    Balwantray C Chauhan

    Dear Editor

    We thank Dr. Alm for his interest and comment on our paper entitled “Practical recommendations for measuring rates of visual field change in glaucoma.” We agree that the standard error of slope estimates is dependent on the number of examinations and duration of follow-up. However, these two parameters are not interchangeable. As pointed out correctly by Dr. Alm, the same number of examinations ov...

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    There are many pertinent and interesting observations in your article. As one of the first few users of PASCAL in India, we have now a large data-base of patients in a short span of time. Critical to understanding PASCAL is the fluence. Contrary to what we always thought, retinal hemorrhages and acoustic damage are not seen at 10 ms pulses if the fluence is within limits. I wish that PASCAL was also programmed to fix the flue...

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  • Multifocal-ERG in ARMD after intravitreal use of bevacizumab
    Marilita M Moschos

    Dear Editor,

    In the article entitled 'Electrophysiological effects of intravitreal Avastin (bevacizumab) in the treatment of exudative age-related macular degeneration (ARMD)' by Karanjia et al (Br J Ophthalmol 2008), the authors examine the sensitivity of multifocal-electroretinogram (mfERG) at measuring changes in retinal electrical activity in response to Avastin treatment for ARMD. In this interesting paper t...

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  • Choroidal Perfusion
    Paul E Beaumont
    Dear Editors

    This is an interesting haematological syndrome. I would question calling the occurrence simultaneous when the vision loss was symptomatically sequential. Roughly 20% of normals have areas of absent choroidal filling in the early venous phase of the retinal circulation. These areas fill suddenly as the dye arrives in a normal manner; if there is true pathological delay such as occurs with giant cell arteritis the...

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  • O C T : limits of the retinal-mapping program in age-related macular degeneration
    Srinivas R Sadda
    Dear Editors

    We read with interest the recent study by Krebs et al. demonstrating the limitations of StratusOCT mapping software in the context of age-related macular degeneration (AMD).[1] We wish to applaud the authors for their study - while the limitations of StratusOCT automated analysis have previously been reported,[2] the fact remains that many ophthalmologists may not be well acquainted with these errors. We agree wi...

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  • Authors' reply
    Gerald McGwin Jr.
    Dear Editors

    We appreciate Dr. Kadyan’s letter regarding our study “Non-arteritic anterior ischaemic optic neuropathy and presumed sleep apnoea syndrome screened by the Sleep Apnea scale of the Sleep Disorders Questionnaire (SA-SDQ)” [1]. He requests clarification on several issues and, to the best of our ability we will attempt to respond to each in turn. Regarding the proportion of cases and controls diagnosed with glauco...

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  • Authors' response
    Ludwig M. Heindl

    Dear Editors

    We thank Dr Munier and Dr Satgé for their interest in our work on “Aggressive metastasising adenocarcinoma of the retinal pigment epithelium with trisomy 21” [1] and welcome the opportunity to respond to their comments.

    We are in agreement with Dr Munier and Dr Satgé that life-threatening ophthalmic tumours must be kept in mind while taking care of patients with Down syndrome. Despite an imp...

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  • Is a field every 4 month a significant improvement over a field every 6 months?
    Albert Alm

    Dear Editors

    How often should we do visual fields in the first 2 years? Chauhan and co-workers [1] recommend 3 visual fields per year. It will have an 80% power of detecting a rate of loss of 2 dB/year in an eye with moderate variability. Is this a significant improvement over 2 fields per year? In order to answer that we should look at the efficacy of increasing the frequency of field examinations versus prolongin...

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  • Vitreous buffering capacity as a mechanism for silicone oil optic
    morteza mehdizadeh

    Vitreous buffering capacity as a mechanism for silicone oil optic neuropathy

    Dear editors

    I read with interest the article concerning silicone oil optic neuropathy by Knecht et al in October issue of BJO. In that article they suggest an active transport of silicone oil into the optic nerve as a mechanism for optic neuropathy. [1] I would like to suggest a new mechanism based on buffering capacity...

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  • OCT measurement and visual function
    Caroline J Styles

    Dear Editors

    We read with interest the study from Moutray et al[1] that found Optical Coherence Tomography (OCT) measures are not robust markers for visual function. We have looked at 20 patients with wet age related macular degeneration (AMD) and compared visual function and OCT measures using the new generation of Fourier Domain 3D OCT. We also find no significant correlation between OCT measurements of central...

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