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visual disturbance
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VISUAL DISTURBANCES
REFRACTIVE ERRORSDefects prevents the light from converging into a single focus on the retina.
MYOPIANearsightedness; most commonLights to be focused in front of the retina.Causes blurred distance visionDue to excessive light refraction by the cornea or the lens abnormally long eye.Swelling of the lens by excessive glucose
HYPEROPIAFarsightedness; less commonLight rays to be focused behind the retina.Blurred near vision Due toCornea or the lens does not had the focusing powerEyeball is too short
PRESBYOPIALoss of accommodation associated with ageGenerally at 45years; less commonBlurred near vision.Due to: Crystalline lens become larger, firmer, or less elastic.Reduces accommodation abilityDifficulty in nearby objects
ASTIGMATISMIrregular corneal structureIncoming light rays to be bent unequallyLight rays do not come to a single point of focus on the retina.Causes blurred vision; ocular fatigue
APHAKIAAbsence of crystalline lensCongenital or cataract surgery removalLights projected behind the retinaNo near vision
COLLABORATIVE MANAGEMENTCORRECTIVE GLASSES:Concave and convex lensesReading glasses for presbyopia
Contact lensesMade up of various type of thin plastic that fit over the cornea.
CONTACT LENSESSOFTRIGIDGAS PERMEABLE LENSESExtended wearDisposable lenses
CONTACT LENSES
REFRACTIVE SURGERYPHOTO REFRACTIVE KERATOTOMY
PATIENT EDUCATIONRegular eye examinationEarly diagnosis and treatmentEye careVitamin intake
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