eLetters

66 e-Letters

published between 2008 and 2011

  • Vision screening in children by Plusoptix Vision ScreenerTM compared with gold standard orthoptic as
    Robert W Arnold

    American pediatricians, armed with a new reimbursement code for photoscreening young children (99174), are very interested in the validity of potential instruments.  As such, we were interested in the recent report that compared Plusoptix photoscreener to orthoptic exam in early primary school children, reporting 100% specificity but relatively low sensitivity: “the sensitivity of the PVS to detect amblyopia-associated f...

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  • Comments on 23-gauge versus 20-gauge system for pars plana vitrectomy
    Anshuman Sinha

    Dear editor,

    We read with interest the paper by Wimpissinger et al comparing sutureless 23-gauge system to a standard 20-gauge system for pars plana vitrectomy, in a randomized clinical trial.[1] We aim to highlight a few issues in the design, methodology and analysis.

    The authors have analysed postoperative pain and conjunctival injection as primary outcome measures. The effort by the assessor to elicit a...

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  • Fast Macular Thickness Versus Radial Lines protocol?
    Pearse A Keane

    I read with interest the recent study by Yi et al.

    A very minor point... were the Stratus OCT images obtained using the "Radial Lines" protocol or the "Fast Macular Thickness" protocol? From Figure 1, I suspect that the higher resolution Radial Lines protocol was used (and not Fast Macular Thickness as described in the manuscript).

    In any event, I commend the authors for a worthwhile addition to the li...

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  • Spontaneous visual improvement in dominant optic atrophy
    Michael S Lee

    Dear Editor:

    I read with interest the article by Dr. Cohn, et al regarding the natural history of autosomal dominant optic atrophy (DOA). The authors describe an average of 10-year follow up for 69 patients with genetically confirmed DOA. In their study, 6 (9%) patients enjoyed improvement in visual acuity by 2 or more lines.

    I found this surprising, and I wonder if the authors could provide...

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  • Authors Response
    William H Morgan

    Author’s Response re letter by Nathan M Radcliffe

    Dear Editor,

    We are very interested to read Prof Radcliffe’s data showing a variable IOP rise in different subjects tested with the same goggle design. Their results, like ours,[1] suggest that individual anatomic or physiologic factors are important in determining the IOP rise. Currently, these factors are unknown with significant certainty, however som...

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  • Swimming goggles and elevated intraocular pressure
    Nathan M Radcliffe

    We would like to congratulate Drs Morgan and colleagues on their recent paper “Wearing swimming goggles can elevate intraocular pressure.” We performed a similar study and presented our data at the Association for Research in Vision and Ophthalmology in 2007. Our findings demonstrated that in healthy participants, IOP measurements taken during goggle wear were significantly higher at both one and five minutes, with an av...

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  • 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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  • PASCAL FLUENCE
    ROHIT Dr. GROVER

    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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