Inhertance of ectopia lentis et pupillae
Sli like displaced pupil that deviates in opposite direction of displaced subluxed lens
Autosomal recessive
Where is lens displacement in Marfan syndrome
Superotemporal
Defective fibrillin wekanes zonules
Displacement of lens in homocystinuria
Inferonasal
Tall
50% have intellectual disability
Myopia
Glaucoma
Accumulation of homocysteine and methionine
Kockkneed
Osteoporosis
VTE
Fine fair hair
Autosomal recessive
Weill Marchesani syndrome
Microspherophakia
RD
Inferonasal lens subluxation
Short stature
BRachydactyly
Reduced IQ
AR
Features of Stickler’s
RD
High myopia
CAtaracts
Ectopia lentis
Glacuoma
Calculation of IOL power following refractive surgery
Rigi CL used with known BC and dioptric power placed on eye followed by over refraction
True corneal power = BC of CL + CL power + over refraction - sphericla equivalent of manifest refraction without CL
When to repeat biometry
AL difference > 0.7mm
Acial length < 21.2mm or > 26.6mm
MEan K < 41D or >47D
Delta K > 2.5D
Differnece in mean keratometry between eyes > 0.9D
Viscoadaptive OVDs
At higher flow rate - more pseudo dispersive - less viscous - protects endothelium
At low flow rates - more viscous and cohesive
More difficult to remove from eye
Alport syndrome
Type IV collagen
85% X linked
COL4A5 gene
Anterior lenticonus
Dot and fleck retina
Sensorineural deafness
Nephritis
