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I thought this one:
http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum
Klin Oczna. 2006;108(1-3):73-7. [Assessment of tears secretion after refractive surgery]
Mrukwa-Kominek E, Stala P, Gierek-Ciaciura S, Lange E.
... was quite interesting as a post- PRK patient. It shows that tear production increases up to 6 months. The increase starts to flaten off. Being 10 months post PRK itīs difficult to know what to make of it. I wonder if there are studies in which the Schirmer I test is measured over a longer period than this?
These are my calculations as a dumb scientist
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If I assume a logathrimic fit and find a best-fit using excel, this gives:
y = 3,2025Ln(x) + 11,688
where x is in months. y is from the PRK results.
at 6 months the schimer test was: 17.4 mm
at 12 months the equation gives a schimer test of: 19.65 mm
at 18 months: 20.94 mm
at 24 months: 21.86 mm
Considering the pre PRK value was 20.9 mm, it seems that most improvement will appear within 1 year. After 1 and a half years the improvement is likely to be minimal or non existant or span years.
Because the article was in polish I couldnīt read it. I wonder if the results depended on the refractive correction, being male/female, or other factors.
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Desert Cry
http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum
Klin Oczna. 2006;108(1-3):73-7. [Assessment of tears secretion after refractive surgery]
Mrukwa-Kominek E, Stala P, Gierek-Ciaciura S, Lange E.
... was quite interesting as a post- PRK patient. It shows that tear production increases up to 6 months. The increase starts to flaten off. Being 10 months post PRK itīs difficult to know what to make of it. I wonder if there are studies in which the Schirmer I test is measured over a longer period than this?
These are my calculations as a dumb scientist
------------------
If I assume a logathrimic fit and find a best-fit using excel, this gives:
y = 3,2025Ln(x) + 11,688
where x is in months. y is from the PRK results.
at 6 months the schimer test was: 17.4 mm
at 12 months the equation gives a schimer test of: 19.65 mm
at 18 months: 20.94 mm
at 24 months: 21.86 mm
Considering the pre PRK value was 20.9 mm, it seems that most improvement will appear within 1 year. After 1 and a half years the improvement is likely to be minimal or non existant or span years.
Because the article was in polish I couldnīt read it. I wonder if the results depended on the refractive correction, being male/female, or other factors.
-----------
Desert Cry
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