How do you use a HOTV chart?

Start from the top line, ask the child to identify the first optotype on the RIGHT side of the chart moving down the lines until an optotype is missed. Return to the line above the missed optotype and ask the child to identify each letter or shape on that line, reading left to right.

Is a kind of chart used in testing the eyes?

Snellen chart used for visual testing. An eye chart, or optotype, is a chart used to measure visual acuity. Eye charts are often used by health care professionals, such as optometrists, physicians or nurses, to screen persons for vision impairment.

What is Bailey Lovie chart?

The Bailey-Lovie chart features a stringent logarithmic progression of optotypes. The chart comes in a set of two panels (W x H 56 x 65 cm). One panel for measuring distance visual acuity at normal contrast, and one for measuring visual acuity at low contrast (contrast value=0.1).

What is the meaning of 6 6?

Many people refer to ‘perfect’ vision as ‘6/6′ or ’20/20’ (US notation measured in feet), but this is not strictly true – these terms refer to ‘average’ vision. If you achieve a vision measurement of 6/6, this means that you can see at a distance of 6m what an average person also sees at the same distance.

What does it mean if your vision is 20 25?

20/25 vision simply means that what you (first number) can see at 20 feet, someone with average (good) vision can see at 25 feet. It’s therefore slightly below the average, because the average person can see it a little farther away.

What does HOTV stand for in vision?

HOTV: a particular vision test used in testing. preschool children. Ish: Ishihara – test for red-green color deficiencies.

What does LogMAR 0.2 mean?

The term LogMAR is an acronym for the Logarithm of the Minimum Angle of Resolution. The letter size is described in LogMAR units where LogMAR 0.00 is equivalent to 6/6 (20/20) and LogMAR 1.00 is equivalent to 6/60 (20/200). The letter size change in units of 0.1 LogMAR from one row to the next.

What are the letters in the Sloan chart?

This set of optotypes consists of ten specially formed “letters”, C, D, H, K, N, O, R, S, V and Z. These letters, unlike the ones used in older Snellen charts, are designed to give acuity testing results that are comparable to tests made using Landolt broken rings .

Which is more accurate Sloan or Snellen eye charts?

They are based on the Landolt “C” Rings, an international gold standard. They proved to be more accurate than Snellen Letters. Today’s improved Snellen eye charts use the Sloan letters and are the charts most commonly used by school nurses.

When did Louise Sloan change the Snellen chart?

In 1952, a revision was made to the original Snellen chart when Louise Sloan, PhD introduced 10 optotypes, or letters – C D H K N O R S V Z. These letters have several advantages: They do not have serifs. They are roughly equal in size. They are based on the Landolt “C” Rings, an international gold standard.

What kind of font is the Snellen chart?

The Snellen Chart uses Snellen letters, which have “hooks”. This type of font is a serif font. Additionally, there were varying amounts of optotypes on each line. Both of these characteristics contributed to inconsistent acuity measurements.