irregular astigmatism

5
Irregular Astigmatism Irregular change of refractive power in different meridia

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Page 1: Irregular astigmatism

Irregular Astigmatism

Irregular change of refractive power in different meridia

Page 2: Irregular astigmatism

Etiological Types

• Curvatural IA

– Extensive corneal scars

– Keratoconus

• Index IA

– Cataract

Page 3: Irregular astigmatism

Clinical Picture

• Signs

– Defective vision

– Distortion of objects

– Polyopia

• Symptoms

– Retinoscopy: Irregular pupillary reflex

– Slitlamp exam: Corneal irregularity

– Placido’s disc test: Distorted circles

– Photokeratoscopy: Irregular corneal curvature

Page 4: Irregular astigmatism

Treatment

• Optical treatment

– Contact lens

• Phototherapeutic keratectomy

– Excimer laser

– Superficial corneal scar

• Surgical treatment

– Extensive corneal scarring

– Penetrating keratoplasty

Page 5: Irregular astigmatism

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