Lecture Note: Snellen's Chart - Edubirdie

University:
Camosun College
Course:
NURS132 | Promoting Health and Wellbeing
Academic year:

2023
Views:

52

Pages:

4
Author:

Aysha A

SNELLEN'S chart Topmcert lettes → cargest Normal distance letters become smaller. nellen's chart is associated wit 7-8 ros and each row is associated with a numer. icdecilly number encould be written in each Row along with that. 1st rew 60 - 36 mor pie - 24 morore 4th row - 18 5th row - 12 9 marut? 7th sew G. 8th raw - 5 These numeurs clencetes the distant from. each row from which the letters can be reads by a cermal person @ distance of resting - omts/20 feet" Pl's uiricon is (1/24) 6 distance at warch patient → distance for puuron N Methodt Pt stanche atom & reads letters from sot- to battom of it reads all raius upto throw' Ef is read only till the 4th raw (18) Di com) ↓ 6/6 willon N 6/18 → decreand 0% > 6/9 > 6/12 > 6/18>6/24>6/3626/60 This means 6/60 of pariona came read al we ask him to move to sm, 4m, 3m, am, Im and the record the vision. after 60 finger counting (FC.CF) More 10 face > Hand malment perception د perception of light ceart vision reconcicellle on snell's chart 1/60 مد principle of smellen's chart. Each letter (optotype) sultends an angle of 5 minutes of arc -at the nodal paint of eys when wheed from its respective diramu n(a) 363 60m in the above diagram the first letrer is at 60 m rublending an angle of sm of are at light n (f) and the econd row ras a distance of 30m height (n(2) when vierel distan u and rame angle of s'arc from a respective rach letter in called as SNELLEN'S chart is OPTOTYPE athy letter maters an angle of 5' and it is walld on construction of the letter. je each letter is divided into s grils (5x5) at an angle of !!

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