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If the top letter cannot be seen at 1 meter, the patient is asked to count fingers; the examiner holds a certain number of fingers close to the patient's face. Finger counting at 6 meters is usually considered equivalent to 6/60, as the size of the 6/60 letter is roughly similar to a finger.

ETDRS charts present a series of five letters of equal difficulty on each row, with standardized spacing between letters and rows, for a total of 14 lines (70 letters).

ETDRS charts were theoretically superior to Snellen charts because interpatient differences were more accurately measured and longitudinal follow-up measurements had more consistent precision, regardless of whether the patients had high or low levels of visual acuity.

ETDRS letter score can be calculated when 20 or more letters are read correctly at 4.0 metres; the visual acuity letter score is equal to the total number of letters read correctly at 4.0 metres plus 30.

The visual acuity test is used to determine the smallest letters you can read on a standardized chart (Snellen chart) or a card held 20 feet (6 meters) away.

ETDRS charts provide three methods for recording VA, including logMAR, fractional and decimal recording methods. The measuring range is 1.0 to -0.3 (logMAR recording method).

An ETDRS letter score can be calculated as follows: when 20 or more letters are read correctly at 4.0 m, the visual acuity letter score is equal to the total number of letters read correctly at 4.0 m plus 30.

To compare accuracy, reproducibility and test duration for the Snellen and the Early Treatment Diabetic Retinopathy Study (ETDRS) charts, two main tools used to measure visual acuity (VA).

The ETDRS Disease Severity Scale was developed to differentiate severe proliferative from nonproliferative diabetic retinopathy.

The ETDRS charts are 64.8 cm wide and 62.2 cm high (25.5 x 24.5 inches).

CSV-1000 ETDRS The CSV-1000 allows testing up to 20/200 at a test distance of 8 feet, or up to 20/125 at a distance of 4 meters.

The ETDRS charts are 64.8 cm wide and 62.2 cm high (25.5 x 24.5 inches).

If the top letter cannot be seen at 1 meter, the patient is asked to count fingers; the examiner holds a certain number of fingers close to the patient's face. Finger counting at 6 meters is usually considered equivalent to 6/60, as the size of the 6/60 letter is roughly similar to a finger.

ETDRS charts present a series of five letters of equal difficulty on each row, with standardized spacing between letters and rows, for a total of 14 lines (70 letters).

ETDRS charts were theoretically superior to Snellen charts because interpatient differences were more accurately measured and longitudinal follow-up measurements had more consistent precision, regardless of whether the patients had high or low levels of visual acuity.

ETDRS letter score can be calculated when 20 or more letters are read correctly at 4.0 metres; the visual acuity letter score is equal to the total number of letters read correctly at 4.0 metres plus 30.

The visual acuity test is used to determine the smallest letters you can read on a standardized chart (Snellen chart) or a card held 20 feet (6 meters) away.

ETDRS charts provide three methods for recording VA, including logMAR, fractional and decimal recording methods. The measuring range is 1.0 to -0.3 (logMAR recording method).

An ETDRS letter score can be calculated as follows: when 20 or more letters are read correctly at 4.0 m, the visual acuity letter score is equal to the total number of letters read correctly at 4.0 m plus 30.

To compare accuracy, reproducibility and test duration for the Snellen and the Early Treatment Diabetic Retinopathy Study (ETDRS) charts, two main tools used to measure visual acuity (VA).

The ETDRS Disease Severity Scale was developed to differentiate severe proliferative from nonproliferative diabetic retinopathy.

The ETDRS charts are 64.8 cm wide and 62.2 cm high (25.5 x 24.5 inches).

CSV-1000 ETDRS The CSV-1000 allows testing up to 20/200 at a test distance of 8 feet, or up to 20/125 at a distance of 4 meters.

The ETDRS charts are 64.8 cm wide and 62.2 cm high (25.5 x 24.5 inches).