A Snellen chart is used to measure the clarity of eyesight. Starting with one large letter, each row contains an increasing number of letters in decreasing size. Results of the test are shown as fraction, such as 6/6. The first number is the distance the chart is viewed from (6 m), the second is the distance at which an observer with normal vision can see a letter clearly (6 m). This chart is used by the DVLA as part of the driving standards that apply to all UK road-users.
The LogMAR chart is another method of assessing visual acuity. The chart contains rows of 5 letters in decreasing size, and the result is given as a decimal, such as 0.3. This number is scored from taking a base-10 logarithm of the minute(s) of visual angle e.g 2 minutes of visual angle scores LogMAR 0.3. The LogMAR chart therefore offers a more precise measure of visual acuity, compared to Snellen.
Early Treatment Diabetic Retinopathy Study is a method of visual acuity testing designed to eliminate inaccuracies in Snellen tests and the result is represented as a letter score. It is the best known example of a LogMAR chart and is used in clinical practice to make decisions around treatments. In this app, it was scored at distance of 1 m.
Reporting of side effects and quality complaints
Instructions for patients
If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed in the package leaflet. You can also report side effects directly via the Yellow Card Scheme at. http://www.mhra.gov.uk/yellowcard.
You can also report side effects and quality complaints to Bayer Plc. Further information is available on the “contact” tab at www.bayer.co.uk.
By reporting side effects you can help provide more information on the safety of this medicine.
Reporting adverse events and quality complaints
Instructions for healthcare professionals
Adverse events should be reported. Reporting forms and information can be found at http://www.mhra.gov.uk/yellowcard.
Adverse events should also be reported to Bayer plc.
Further information is available on the “contact” tab at www.bayer.co.uk.