{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,10]],"date-time":"2026-07-10T14:45:50Z","timestamp":1783694750373,"version":"3.55.0"},"reference-count":0,"publisher":"Nepal Journals Online (JOL)","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nep J Oph"],"abstract":"<jats:p>Aim: To study the various ocular anatomical and physiological parameters in presbyopia. Materials and methods: We studied the various ocular anatomical and physiological parameters like corneal curvature (keratometry readings: K1 and K2), central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT) and axial length (AL) in 100 presbyopic patients between 35 - 55 years of age. The patients were divided into two age groups: I (35 \u2013 44 years) and II (45-55 yrs). ACD,  AL and LT were measured using an Ascan. CCT was measured with ultrasonic pachymetry. Results: The CCT decreased (BE), LT increased and ACD decreased (RE) significantly with increasing age (p &lt; 0.05). There was no significant difference in males and females. Nearly 3\/4th of the total increase in lens thickness was responsible for the decrease in the anterior chamber depth and the rest, 1\/4th , goes posteriorly. Corneal curvature and AL showed no significant change with age. Conclusions: The mean of CCT decreased significantly with advancing age. As age increased, the mean value of lens thickness increased and anterior chamber depth decreased. Nearly 3\/ 4th of total increase in LT was anteriorly, decreasing the ACD. Corneal curvature and AL has no relation with age. Key words: Presbyopia, central corneal thickness, anterior chamber depth, lens thickness, axial length DOI: http:\/\/dx.doi.org\/10.3126\/nepjoph.v3i2.5269 Nepal J Ophthalmol 2011; 3(2): 155-158<\/jats:p>","DOI":"10.3126\/nepjoph.v3i2.5269","type":"journal-article","created":{"date-parts":[[2011,8,19]],"date-time":"2011-08-19T05:32:55Z","timestamp":1313731975000},"page":"155-158","source":"Crossref","is-referenced-by-count":1,"title":["Presbyopia and its anatomical and physiological variants"],"prefix":"10.3126","volume":"3","author":[{"given":"M","family":"Gupta","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"RR","family":"Sukul","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Y","family":"Gupta","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M","family":"Dey","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A","family":"Phougat","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"U","family":"Bhardwaj","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S","family":"Dixit","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1670","published-online":{"date-parts":[[1970,1,1]]},"container-title":["Nepalese Journal of Ophthalmology"],"original-title":[],"link":[{"URL":"https:\/\/www.nepjol.info\/index.php\/NEPJOPH\/article\/download\/5269\/4379","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/www.nepjol.info\/index.php\/NEPJOPH\/article\/download\/5269\/4379","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2018,12,28]],"date-time":"2018-12-28T12:02:02Z","timestamp":1545998522000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.nepjol.info\/index.php\/NEPJOPH\/article\/view\/5269"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1970,1,1]]},"references-count":0,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2011,8,18]]}},"URL":"https:\/\/doi.org\/10.3126\/nepjoph.v3i2.5269","relation":{},"ISSN":["2091-0320","2072-6805"],"issn-type":[{"value":"2091-0320","type":"electronic"},{"value":"2072-6805","type":"print"}],"subject":[],"published":{"date-parts":[[1970,1,1]]}}}