Expert: Dr Manu C Rajnani - 11/6/2009

Question
Hello
You are a very busy person. I am afraid, You will not answer my so many questions. But you are a merciful person. So I will wait for your answers.
Question 1:
I am a patient of primary chronic open angle glaucoma and my anterior chamber angle is narrow. I have severe cataract. I am using glaucoma medicines (Travatan and Betagan), and my I.O.P. is reduced from 37 to 17 mmHg. I will need perimetry after every few months to know whether my visual field loss progression has stopped or not.
Which type of perimetry (White-on-White / Blue-on-Yellow) will be better for me? If, in cataract obstructing view of the retina, neither White-on-White perimetry nor Blue-on-Yellow perimetry can be performed reliably, then how my visual field loss progression can be evaluated? I do not want to remove cataract now, because I want to wait for few years for a combined surgery of cataract and glaucoma.
Question 2:
What are pre-requirements for perimetry? I mean, is evaluation of Visual Acuity and Refraction, necessary before perimetry?
Question 3:
Perimetry result is written on a chart. Many things are written on it. e.g. GHT, PSD, d B, Total deviation, Pattern deviation, False negative errors, False positive errors, Fixation losses, Fovea off, Strategy Sita Fast, Visual Acuity Rx Ds Dc X.
I want to know the meanings of above words. I want to understand graphs on the chart. I want to get deep information of perimetry. I want to get deep information of glaucoma. Is there any website from where I can read such deep information?
Thank You,
Best regards,
Allen.


Answer
Dear  ALLEN
thanx for asking such elaborate and interesting question

AS you mentioned that you have cataract all the parameters on perimetry testing have NO value at all because it may not give accurate results so the only way IS GET YOUR CATARACT SURGERY DONE FIRST alongwith glaucoma surgery combined and then think of perimetry and its parameters and just for the record blue on yellow is best

if you any further questions please revert back to me on my email address at "manulasereye@yahoo.com"
thanking you
Dr.Manu C.Rajnani
Dr.Manu's Laser Eye Surgery Center
Sarasati Society, Plot 433, TPS 3,
15th Road, Khar(West), Mumbai 400052.INDIA
Tel: 91-22-26006801-26004467 & 26007828
Tel: Mobile: 91-9821032072