Verteporfin photodynamic therapy for neovascular age-related ...
Verteporfin photodynamic therapy for neovascular age-related ... Verteporfin photodynamic therapy for neovascular age-related ...
152 Appendix 1Appendix 6:Protocol for Pelli-Robson Contrast SensitivityAssessmentTest ConditionsThe Chart.• There are two charts to be used on each eye separately.• Each chart has different letter sequences but are otherwise identical.• The letters on the chart are organised into groups of three (i.e. triplets) therebeing two per line.• Within each triplet all letters have the same contrast.• The contrast decreases from one triplet to the next.• The division into triplets is indicated on the scoring sheet but not on the chartitself.• Unlike an acuity chart, in which the difficulty increases from line to line, in thePelli-Robson chart the difficulty increases in the middle of each line as well.Mounting the chart.• The chart should be hung so that the centre of the chart is at the level of thepatient’s eyes.• The patient should be seated on a chair that can have the height adjusted orthe chart can be moved up or down based on the height of the patient.Illuminating the chart.• The chart should be illuminated as uniformly as possible, so that theluminance of the white areas is between 60 to 120 foot candles.• Measure the illumination in all four corners of the chart to ensure that this isuniform.• The chart should be used in the same setting for all patients and at every visiti.e. located within a specified area or hung within a illuminated frame.• Avoid glare.Supplier of ETDRS chartsPelli-Robson LogMAR ETDRS Chart Panels can be obtained from:Clement Clarke InternationalEdinburgh Way,Harlow,EssexTel: 01279 414969Fax: 01279 635232
DOI: 10.3310/hta16060Health Technology Assessment 2012; Vol. 16: No. 6153Contrast Sensitivity Testing• Test patients before adding drugs to the conjunctival sac.• Test CS after logMAR visual acuity testing has been completed.• If the patient was refracted at 2 M add +0.5 D to correction, or if refracted at4M add +0.75 D.• The patient must sit one metre from the chart.• Test the right eye then the left eye.• The eye not being tested must be covered.• Test the right eye with the chart V, R and S as the first triplet.• Test the left eye with the chart that contains H, S and Z as the first triplet.• The charts should remain hidden from view until the eye is ready for testing.Recording the patient’s performance.• Complete the header of the record worksheet.• Ask the patient to name each letter on the chart starting with the dark letterson the upper left-hand corner and reading horizontally across the entire line.• The lighter letters can take some time to appear so ask the patient to keeplooking and not give up too soon• Do not agree or disagree with the patient. You may encourage the patient tocontinue to read.• Circle each letter read correctly and cross out each letter read incorrectly.• Leave letters not attempted unmarked.• Test the right eye then the left eye.Do not let the patient give up too soon. Patients should be made to guess even if theybelieve the letters are completely invisible. Always allow several seconds for the faintestletters to appear, but do not let the patient give up until he or she has guessed incorrectly 2of 3 letters in a triplet. The reliability of the results depend on the consistency of theexaminer’s approach.Scoring the test. The patient’s sensitivity is indicated by the faintest triplet for which 2 of the3 letters are named correctly. The log contrast sensitivity for this triplet is given by thenumber on the worksheet nearest to the triplet. Enter this number as the Log ContrastSensitivity Score.© Queen’s Printer and Controller of HMSO 2012. This work was produced by Reeves et al. under the terms of a commissioning contract issued by theSecretary of State for Health.
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152 Appendix 1Appendix 6:Protocol <strong>for</strong> Pelli-Robson Contrast SensitivityAssessmentTest ConditionsThe Chart.• There are two charts to be used on each eye separately.• Each chart has different letter sequences but are otherwise identical.• The letters on the chart are organised into groups of three (i.e. triplets) therebeing two per line.• Within each triplet all letters have the same contrast.• The contrast decreases from one triplet to the next.• The division into triplets is indicated on the scoring sheet but not on the chartitself.• Unlike an acuity chart, in which the difficulty increases from line to line, in thePelli-Robson chart the difficulty increases in the middle of each line as well.Mounting the chart.• The chart should be hung so that the centre of the chart is at the level of thepatient’s eyes.• The patient should be seated on a chair that can have the height adjusted orthe chart can be moved up or down based on the height of the patient.Illuminating the chart.• The chart should be illuminated as uni<strong>for</strong>mly as possible, so that theluminance of the white areas is between 60 to 120 foot candles.• Measure the illumination in all four corners of the chart to ensure that this isuni<strong>for</strong>m.• The chart should be used in the same setting <strong>for</strong> all patients and at every visiti.e. located within a specified area or hung within a illuminated frame.• Avoid glare.Supplier of ETDRS chartsPelli-Robson LogMAR ETDRS Chart Panels can be obtained from:Clement Clarke InternationalEdinburgh Way,Harlow,EssexTel: 01279 414969Fax: 01279 635232
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