OPTOM FASLU MUHAMMED

The following standards have been reproduce by kind permission of the association of optometrists and the civil aviation authority

MOTORISTS STATIC VISUAL ACUITY The standard for the ordinary

drivers is the ability toread in goof light

THE STANDARD OF VISUAL ACUITY APPLICABLE IS

Acuity [with aid of corrective lenses if necessary] of atleast 6/9 in the better eye or 6/12 in the worse eye or uncorrected acuity of 3/60 in one eye

VISAL FIELD Ordinary drivers are required to have a field of

vision atleast 120 degree within the horizontal measure by the Gold Man perimeter

If any homonymous or bitemporal defects that come close to fixation, whether hemianopic or quandrantopic, are accepted as safe for driving. Isolated scotoma repesented in the binocular field near to the central fixation point may be inconsistent with safe driving

DIPLOPIA Diplopia causes unfitness to drive. Late onset

sudden diplopia due to a minor stroke precludes driving for 1 month. Then if persisting and superable with prismatic lens masking.

Driving is permitted providing the d\ the driver gives an undertaking always to wear the lens or patch when driving

COLOUR VISIONImpaired colour vision is sometimes a bar to

driving.Methods of testing colour perception is ,

Ishihara test

VISION UNDER ADVERSE LIGHTING CONDITIONS

Pts who have cataracts and those having undergone refractive Sx may be unable to meet the required conditions of poor light or glare.

A history of inability to see effectively when driving at night with headlights is due to a night vision defects such as retinitis pigmentosa or choridoretinitis precludes in issuing driving license

MONOCULAR DRIVERSRecent loss of an eye may require a period of

driving for adaptation, but then driving may be resumed subject to meeting the above standard to meeting the above standards

DIABETIC RETINOPATHYTreatment of proliferative diabetic

retinopathy by pan retinal photocoagulation can cause reduced visual field and jeopardize the right to drive

Optometrists are frequently asked by the pts whether they are visually fit to drive

Visual acuity can be measured on the basis of snellen acuity

The other aspect of vision outlined above should be taken in account

An appropriate should be given on the pt’s record card.

FRAMES AND LENSESCare should be taken in frame selection not

to obscure lateral visionAdvise should be given on the limitations of

high power lenses or at nightand of photochromic lenses when entering road tunnels and roads shaded by trees from good day light conditions

FOLLOW UPThe AOP recommends that drivers and riders

should have a retest at the most every 3 yrs upto the age of 70 yrs

Any pathological eye disease should ofcourse be refered for investigation

ROYAL NAVY for medical standards the navy uses

a form of equivalents as follows

Eye sight and colour perception standards

The standards of visual acuity is garded below

Visual acuity to be achieved without correcting lenses

Better eye : 6/12 N5Worse eye : 6/12 N5

REFRACTION LIMIT

Total Hypermetropia

Better Eye = +3.50 DSPH

Worse Eye = +3.50 DSPH

Myopia Better Eye = -0.75 DSPH Worse Eye = -0.75 DSPH

Astigmatism Better Eye = +/- 1.00 DCYL Worse Eye = +/-1.00 DCYL

Methods Of TestingDistance VA should be tested at a distance of 6

meters

Ask whether using of spectacle or contact lens

If yes, bring their spectacle with them

To bring written spectacle prescription

To check VA first uncorrected and then corrected

OCULAR PATHOLOGYPOST PENETRATING INJURIES

POST KERATOTOMY

REFRACTIVE SURGERIES

RETINAL DETACHMENT

NEAR VISION TESTING

NEAR VA IS TESTED USING TIMES ROMAN PRINT ON READING CHARTS APPROVED BY THE BRITISH FACULTY OF OPHTHALMOLOGISTS

COLOUR PERCEPTIONTHE CORRECT RECOGNITION OF 16

PLATES OF ISHIHARA TEST SHOULD BE GIVEN

ISHIHARA PLATES ARE USED AS A SCREENING FOR ALL COLOUR PERCEPTION

BINOCULAR EFFICIEBCYBIFOVEAL FIXATION AND PRFECT

BINOCULAR FUNCTIONS ARE FOR ESSENTIAL REQUIREMENTS UNLESS SPECIFIED BUT A SQUINT MUST BE COSMETICALLY ACCEPTABLE

SPECTACLES AND CONTACT LENSRESTRICTION ON THE WEARING OF

SPECTACLES OR CONTACT LENS.THOSE WHO HAVE CL SHOULD WEAR DEFENCE SPECTACLES.

CL MAY WELL PROVIDE ADVANTAGES OVER SPECATCLES.ENHANCING PERIPHERAL VISION AND REDUCING REFLECTION AND ABERRATIONS

REFRACTIONHYPERMETROPIA IN YOUNG

PERSON,CONSIDERABLE HEPERMETROPIA MAY BE PRESENT WITHOUT ANY APPARENT EFFECT ON EITHER NEAR OR DISTANT VISION.FOGGING SHOULD BE DONE TO MEASURE MANIFEST HYPERMETROPIA.

MYOPIA SHORT SIGHT AFFECTS DISTANCE

VA.THE CANDIDATES SHOULD BE ASKED TO PROVIDE A SPECTACLE PRESCRIPTION,WHICH WILL SHOW THE DEGREE OF MYOPIA PRESENT.

OTHER ABNORMALITIES OF THE EYES OR VISUAL SYSTEMANY ABNORMALITIES OF THE EYE OR

VISUAL SYSTEM MAY BE CAUSE FOR REJECTION EVENTHOUGH VISUAL FUNCTIONS WITHIN THE STANDARDS LIIMITS.