Revision lecture Padlet questions

Question 1

Effects of increasing or reducing BOZR and TD

Answer 1

Increasing the TD will increase the stability of the lens i.e tighter fit

Reducing the TD will reduce the stability of the lens

Increasing BOZR will result in a flatter fit

Reducing BOZR will result in a steeper fit

Question 2

When to change TD oe BOZR

Answer 2

If the fit is too tight or steep, you want to reduce the TD or increase the BOZR, or do a combo of the both

If your fit is too loose or flat, you want to increase TD or reduce BOZR or once again a combo of the both

Question 3

SER rounding

Answer 3

SER = sphere + (cyl/2)

used to fit soft contact lenses of espically when cyl power is below 0.75D as a toric lens os not necessary for a cylinder of this power

Question 4

SER round below

Rx: -2.00 / -1.00 x 180

Answer 4

Ans: -2.50D

Question 5

Staining as a result of contact lenses

Answer 5

Staining can either be epithelial (superficial) or stromal (deep)

Question 6

Epithelial staining

Answer 6

Usuaully well demarcted with clear borders, most often in patterns like little dots

good example to think of is Spray Paint

Question 7

Stromal staining

Answer 7

More diffuse with hazy borders, as the dye is leaking into the meshwork.

Question 8

Toric BVP calculation