irregular astigmatism
TRANSCRIPT
![Page 1: Irregular astigmatism](https://reader036.vdocument.in/reader036/viewer/2022080214/55ac71191a28ab150a8b45b0/html5/thumbnails/1.jpg)
Irregular Astigmatism
Irregular change of refractive power in different meridia
![Page 2: Irregular astigmatism](https://reader036.vdocument.in/reader036/viewer/2022080214/55ac71191a28ab150a8b45b0/html5/thumbnails/2.jpg)
Etiological Types
• Curvatural IA
– Extensive corneal scars
– Keratoconus
• Index IA
– Cataract
![Page 3: Irregular astigmatism](https://reader036.vdocument.in/reader036/viewer/2022080214/55ac71191a28ab150a8b45b0/html5/thumbnails/3.jpg)
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](https://reader036.vdocument.in/reader036/viewer/2022080214/55ac71191a28ab150a8b45b0/html5/thumbnails/4.jpg)
Treatment
• Optical treatment
– Contact lens
• Phototherapeutic keratectomy
– Excimer laser
– Superficial corneal scar
• Surgical treatment
– Extensive corneal scarring
– Penetrating keratoplasty
![Page 5: Irregular astigmatism](https://reader036.vdocument.in/reader036/viewer/2022080214/55ac71191a28ab150a8b45b0/html5/thumbnails/5.jpg)
Thank you